func_str.result 55.6 KB
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drop table if exists t1;
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set names latin1;
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select 'hello',"'hello'",'""hello""','''h''e''l''l''o''',"hel""lo",'hel\'lo';
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hello	'hello'	""hello""	'h'e'l'l'o'	hel"lo	hel'lo
hello	'hello'	""hello""	'h'e'l'l'o'	hel"lo	hel'lo
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select 'hello' 'monty';
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hello
hellomonty
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select length('\n\t\r\b\0\_\%\\');
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length('\n\t\r\b\0\_\%\\')
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select bit_length('\n\t\r\b\0\_\%\\');
bit_length('\n\t\r\b\0\_\%\\')
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select char_length('\n\t\r\b\0\_\%\\');
char_length('\n\t\r\b\0\_\%\\')
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select length(_latin1'\n\t\n\b\0\\_\\%\\');
length(_latin1'\n\t\n\b\0\\_\\%\\')
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select concat('monty',' was here ','again'),length('hello'),char(ascii('h')),ord('h');
concat('monty',' was here ','again')	length('hello')	char(ascii('h'))	ord('h')
monty was here again	5	h	104
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select locate('he','hello'),locate('he','hello',2),locate('lo','hello',2) ;
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locate('he','hello')	locate('he','hello',2)	locate('lo','hello',2)
1	0	4
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select instr('hello','HE'), instr('hello',binary 'HE'), instr(binary 'hello','HE');
instr('hello','HE')	instr('hello',binary 'HE')	instr(binary 'hello','HE')
1	0	0
select position(binary 'll' in 'hello'),position('a' in binary 'hello');
position(binary 'll' in 'hello')	position('a' in binary 'hello')
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3	0
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select left('hello',2),right('hello',2),substring('hello',2,2),mid('hello',1,5) ;
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left('hello',2)	right('hello',2)	substring('hello',2,2)	mid('hello',1,5)
he	lo	el	hello
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select concat('',left(right(concat('what ',concat('is ','happening')),9),4),'',substring('monty',5,1)) ;
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concat('',left(right(concat('what ',concat('is ','happening')),9),4),'',substring('monty',5,1))
happy
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select substring_index('www.tcx.se','.',-2),substring_index('www.tcx.se','.',1);
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substring_index('www.tcx.se','.',-2)	substring_index('www.tcx.se','.',1)
tcx.se	www
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select substring_index('www.tcx.se','tcx',1),substring_index('www.tcx.se','tcx',-1);
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substring_index('www.tcx.se','tcx',1)	substring_index('www.tcx.se','tcx',-1)
www.	.se
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select substring_index('.tcx.se','.',-2),substring_index('.tcx.se','.tcx',-1);
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substring_index('.tcx.se','.',-2)	substring_index('.tcx.se','.tcx',-1)
tcx.se	.se
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select concat(':',ltrim('  left  '),':',rtrim('  right  '),':');
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concat(':',ltrim('  left  '),':',rtrim('  right  '),':')
:left  :  right:
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select concat(':',trim(leading from '  left  '),':',trim(trailing from '  right  '),':');
concat(':',trim(leading from '  left  '),':',trim(trailing from '  right  '),':')
:left  :  right:
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select concat(':',trim(LEADING FROM ' left'),':',trim(TRAILING FROM ' right '),':');
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concat(':',trim(LEADING FROM ' left'),':',trim(TRAILING FROM ' right '),':')
:left: right:
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select concat(':',trim(' m '),':',trim(BOTH FROM ' y '),':',trim('*' FROM '*s*'),':');
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concat(':',trim(' m '),':',trim(BOTH FROM ' y '),':',trim('*' FROM '*s*'),':')
:m:y:s:
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select concat(':',trim(BOTH 'ab' FROM 'ababmyabab'),':',trim(BOTH '*' FROM '***sql'),':');
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concat(':',trim(BOTH 'ab' FROM 'ababmyabab'),':',trim(BOTH '*' FROM '***sql'),':')
:my:sql:
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select concat(':',trim(LEADING '.*' FROM '.*my'),':',trim(TRAILING '.*' FROM 'sql.*.*'),':');
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concat(':',trim(LEADING '.*' FROM '.*my'),':',trim(TRAILING '.*' FROM 'sql.*.*'),':')
:my:sql:
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select TRIM("foo" FROM "foo"), TRIM("foo" FROM "foook"), TRIM("foo" FROM "okfoo");
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TRIM("foo" FROM "foo")	TRIM("foo" FROM "foook")	TRIM("foo" FROM "okfoo")
	ok	ok
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select concat_ws(', ','monty','was here','again');
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concat_ws(', ','monty','was here','again')
monty, was here, again
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select concat_ws(NULL,'a'),concat_ws(',',NULL,'');
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concat_ws(NULL,'a')	concat_ws(',',NULL,'')
NULL	
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select concat_ws(',','',NULL,'a');
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concat_ws(',','',NULL,'a')
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,a
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SELECT CONCAT('"',CONCAT_WS('";"',repeat('a',60),repeat('b',60),repeat('c',60),repeat('d',100)), '"');
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CONCAT('"',CONCAT_WS('";"',repeat('a',60),repeat('b',60),repeat('c',60),repeat('d',100)), '"')
"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb";"cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc";"dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
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select insert('txs',2,1,'hi'),insert('is ',4,0,'a'),insert('txxxxt',2,4,'es');
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insert('txs',2,1,'hi')	insert('is ',4,0,'a')	insert('txxxxt',2,4,'es')
this	is a	test
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select replace('aaaa','a','b'),replace('aaaa','aa','b'),replace('aaaa','a','bb'),replace('aaaa','','b'),replace('bbbb','a','c');
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replace('aaaa','a','b')	replace('aaaa','aa','b')	replace('aaaa','a','bb')	replace('aaaa','','b')	replace('bbbb','a','c')
bbbb	bb	bbbbbbbb	aaaa	bbbb
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select replace(concat(lcase(concat('THIS',' ','IS',' ','A',' ')),ucase('false'),' ','test'),'FALSE','REAL') ;
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replace(concat(lcase(concat('THIS',' ','IS',' ','A',' ')),ucase('false'),' ','test'),'FALSE','REAL')
this is a REAL test
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select soundex(''),soundex('he'),soundex('hello all folks'),soundex('#3556 in bugdb');
soundex('')	soundex('he')	soundex('hello all folks')	soundex('#3556 in bugdb')
	H000	H4142	I51231
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select 'mood' sounds like 'mud';
'mood' sounds like 'mud'
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select 'Glazgo' sounds like 'Liverpool';
'Glazgo' sounds like 'Liverpool'
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select null sounds like 'null';
null sounds like 'null'
NULL
select 'null' sounds like null;
'null' sounds like null
NULL
select null sounds like null;
null sounds like null
NULL
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select md5('hello');
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md5('hello')
5d41402abc4b2a76b9719d911017c592
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select crc32("123");
crc32("123")
2286445522
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select sha('abc');
sha('abc')
a9993e364706816aba3e25717850c26c9cd0d89d
select sha1('abc');
sha1('abc')
a9993e364706816aba3e25717850c26c9cd0d89d
select aes_decrypt(aes_encrypt('abc','1'),'1');
aes_decrypt(aes_encrypt('abc','1'),'1')
abc
select aes_decrypt(aes_encrypt('abc','1'),1);
aes_decrypt(aes_encrypt('abc','1'),1)
abc
select aes_encrypt(NULL,"a");
aes_encrypt(NULL,"a")
NULL
select aes_encrypt("a",NULL);
aes_encrypt("a",NULL)
NULL
select aes_decrypt(NULL,"a");
aes_decrypt(NULL,"a")
NULL
select aes_decrypt("a",NULL);
aes_decrypt("a",NULL)
NULL
select aes_decrypt("a","a");
aes_decrypt("a","a")
NULL
select aes_decrypt(aes_encrypt("","a"),"a");
aes_decrypt(aes_encrypt("","a"),"a")

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select repeat('monty',5),concat('*',space(5),'*');
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repeat('monty',5)	concat('*',space(5),'*')
montymontymontymontymonty	*     *
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select reverse('abc'),reverse('abcd');
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reverse('abc')	reverse('abcd')
cba	dcba
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select rpad('a',4,'1'),rpad('a',4,'12'),rpad('abcd',3,'12'), rpad(11, 10 , 22), rpad("ab", 10, 22);
rpad('a',4,'1')	rpad('a',4,'12')	rpad('abcd',3,'12')	rpad(11, 10 , 22)	rpad("ab", 10, 22)
a111	a121	abc	1122222222	ab22222222
select lpad('a',4,'1'),lpad('a',4,'12'),lpad('abcd',3,'12'), lpad(11, 10 , 22);
lpad('a',4,'1')	lpad('a',4,'12')	lpad('abcd',3,'12')	lpad(11, 10 , 22)
111a	121a	abc	2222222211
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select rpad(741653838,17,'0'),lpad(741653838,17,'0');
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rpad(741653838,17,'0')	lpad(741653838,17,'0')
74165383800000000	00000000741653838
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select rpad('abcd',7,'ab'),lpad('abcd',7,'ab');
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rpad('abcd',7,'ab')	lpad('abcd',7,'ab')
abcdaba	abaabcd
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select rpad('abcd',1,'ab'),lpad('abcd',1,'ab');
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rpad('abcd',1,'ab')	lpad('abcd',1,'ab')
a	a
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select rpad('STRING', 20, CONCAT('p','a','d') );
rpad('STRING', 20, CONCAT('p','a','d') )
STRINGpadpadpadpadpa
select lpad('STRING', 20, CONCAT('p','a','d') );
lpad('STRING', 20, CONCAT('p','a','d') )
padpadpadpadpaSTRING
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select LEAST(NULL,'HARRY','HARRIOT',NULL,'HAROLD'),GREATEST(NULL,'HARRY','HARRIOT',NULL,'HAROLD');
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LEAST(NULL,'HARRY','HARRIOT',NULL,'HAROLD')	GREATEST(NULL,'HARRY','HARRIOT',NULL,'HAROLD')
HAROLD	HARRY
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select least(1,2,3) | greatest(16,32,8), least(5,4)*1,greatest(-1.0,1.0)*1,least(3,2,1)*1.0,greatest(1,1.1,1.0),least("10",9),greatest("A","B","0");
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least(1,2,3) | greatest(16,32,8)	least(5,4)*1	greatest(-1.0,1.0)*1	least(3,2,1)*1.0	greatest(1,1.1,1.0)	least("10",9)	greatest("A","B","0")
33	4	1.0	1.0	1.1	9	B
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select decode(encode(repeat("a",100000),"monty"),"monty")=repeat("a",100000);
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decode(encode(repeat("a",100000),"monty"),"monty")=repeat("a",100000)
1
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select decode(encode("abcdef","monty"),"monty")="abcdef";
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decode(encode("abcdef","monty"),"monty")="abcdef"
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select quote('\'\"\\test');
quote('\'\"\\test')
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'\'"\\test'
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select quote(concat('abc\'', '\\cba'));
quote(concat('abc\'', '\\cba'))
'abc\'\\cba'
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select quote(1/0), quote('\0\Z');
quote(1/0)	quote('\0\Z')
NULL	'\0\Z'
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select length(quote(concat(char(0),"test")));
length(quote(concat(char(0),"test")))
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select hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))));
hex(quote(concat(char(224),char(227),char(230),char(231),char(232),char(234),char(235))))
27E0E3E6E7E8EAEB27
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select unhex(hex("foobar")), hex(unhex("1234567890ABCDEF")), unhex("345678"), unhex(NULL);
unhex(hex("foobar"))	hex(unhex("1234567890ABCDEF"))	unhex("345678")	unhex(NULL)
foobar	1234567890ABCDEF	4Vx	NULL
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select hex(unhex("1")), hex(unhex("12")), hex(unhex("123")), hex(unhex("1234")), hex(unhex("12345")), hex(unhex("123456"));
hex(unhex("1"))	hex(unhex("12"))	hex(unhex("123"))	hex(unhex("1234"))	hex(unhex("12345"))	hex(unhex("123456"))
01	12	0123	1234	012345	123456
select length(unhex(md5("abrakadabra")));
length(unhex(md5("abrakadabra")))
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select concat('a', quote(NULL));
concat('a', quote(NULL))
aNULL
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select reverse("");
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reverse("")

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select insert("aa",100,1,"b"),insert("aa",1,3,"b"),left("aa",-1),substring("a",1,2);
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insert("aa",100,1,"b")	insert("aa",1,3,"b")	left("aa",-1)	substring("a",1,2)
aa	b		a
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select elt(2,1),field(NULL,"a","b","c"),reverse("");
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elt(2,1)	field(NULL,"a","b","c")	reverse("")
NULL	0	
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select locate("a","b",2),locate("","a",1);
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locate("a","b",2)	locate("","a",1)
0	1
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select ltrim("a"),rtrim("a"),trim(BOTH "" from "a"),trim(BOTH " " from "a");
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ltrim("a")	rtrim("a")	trim(BOTH "" from "a")	trim(BOTH " " from "a")
a	a	a	a
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select concat("1","2")|0,concat("1",".5")+0.0;
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concat("1","2")|0	concat("1",".5")+0.0
12	1.5
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select substring_index("www.tcx.se","",3);
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substring_index("www.tcx.se","",3)

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select length(repeat("a",100000000)),length(repeat("a",1000*64));
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length(repeat("a",100000000))	length(repeat("a",1000*64))
NULL	64000
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Warnings:
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Warning	1301	Result of repeat() was larger than max_allowed_packet (1048576) - truncated
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select position("0" in "baaa" in (1)),position("0" in "1" in (1,2,3)),position("sql" in ("mysql"));
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position("0" in "baaa" in (1))	position("0" in "1" in (1,2,3))	position("sql" in ("mysql"))
1	0	3
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select position(("1" in (1,2,3)) in "01");
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position(("1" in (1,2,3)) in "01")
2
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select length(repeat("a",65500)),length(concat(repeat("a",32000),repeat("a",32000))),length(replace("aaaaa","a",concat(repeat("a",10000)))),length(insert(repeat("a",40000),1,30000,repeat("b",50000)));
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length(repeat("a",65500))	length(concat(repeat("a",32000),repeat("a",32000)))	length(replace("aaaaa","a",concat(repeat("a",10000))))	length(insert(repeat("a",40000),1,30000,repeat("b",50000)))
65500	64000	50000	60000
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select length(repeat("a",1000000)),length(concat(repeat("a",32000),repeat("a",32000),repeat("a",32000))),length(replace("aaaaa","a",concat(repeat("a",32000)))),length(insert(repeat("a",48000),1,1000,repeat("a",48000)));
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length(repeat("a",1000000))	length(concat(repeat("a",32000),repeat("a",32000),repeat("a",32000)))	length(replace("aaaaa","a",concat(repeat("a",32000))))	length(insert(repeat("a",48000),1,1000,repeat("a",48000)))
1000000	96000	160000	95000
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create table t1 ( domain char(50) );
insert into t1 VALUES ("hello.de" ), ("test.de" );
select domain from t1 where concat('@', trim(leading '.' from concat('.', domain))) = '@hello.de';
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domain
hello.de
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select domain from t1 where concat('@', trim(leading '.' from concat('.', domain))) = '@test.de';
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domain
test.de
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drop table t1;
CREATE TABLE t1 (
id int(10) unsigned NOT NULL,
title varchar(255) default NULL,
prio int(10) unsigned default NULL,
category int(10) unsigned default NULL,
program int(10) unsigned default NULL,
bugdesc text,
created datetime default NULL,
modified timestamp(14) NOT NULL,
bugstatus int(10) unsigned default NULL,
submitter int(10) unsigned default NULL
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (1,'Link',1,1,1,'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa','2001-02-28 08:40:16',20010228084016,0,4);
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SELECT CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter), '"') FROM t1;
CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter), '"')
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"Link";"1";"1";"1";"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";"2001-02-28 08:40:16";"20010228084016";"0";"4"
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SELECT CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugstatus,submitter), '"') FROM t1;
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CONCAT('"',CONCAT_WS('";"',title,prio,category,program,bugstatus,submitter), '"')
"Link";"1";"1";"1";"0";"4"
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SELECT CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter) FROM t1;
CONCAT_WS('";"',title,prio,category,program,bugdesc,created,modified+0,bugstatus,submitter)
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Link";"1";"1";"1";"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";"2001-02-28 08:40:16";"20010228084016";"0";"4
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SELECT bugdesc, REPLACE(bugdesc, 'xxxxxxxxxxxxxxxxxxxx', 'bbbbbbbbbbbbbbbbbbbb') from t1 group by bugdesc;
bugdesc	REPLACE(bugdesc, 'xxxxxxxxxxxxxxxxxxxx', 'bbbbbbbbbbbbbbbbbbbb')
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa	aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
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drop table t1;
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CREATE TABLE t1 (id int(11) NOT NULL auto_increment, tmp text NOT NULL, KEY id (id)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1, 'a545f661efdd1fb66fdee3aab79945bf');
SELECT 1 FROM t1 WHERE tmp=AES_DECRYPT(tmp,"password");
1
DROP TABLE t1;
CREATE TABLE t1 (
wid int(10) unsigned NOT NULL auto_increment,
data_podp date default NULL,
status_wnio enum('nowy','podp','real','arch') NOT NULL default 'nowy',
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PRIMARY KEY(wid)
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);
INSERT INTO t1 VALUES (8,NULL,'real');
INSERT INTO t1 VALUES (9,NULL,'nowy');
SELECT elt(status_wnio,data_podp) FROM t1 GROUP BY wid;
elt(status_wnio,data_podp)
NULL
NULL
DROP TABLE t1;
CREATE TABLE t1 (title text) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('Congress reconvenes in September to debate welfare and adult education');
INSERT INTO t1 VALUES ('House passes the CAREERS bill');
SELECT CONCAT("</a>",RPAD("",(55 - LENGTH(title)),".")) from t1;
CONCAT("</a>",RPAD("",(55 - LENGTH(title)),"."))
NULL
</a>..........................
DROP TABLE t1;
CREATE TABLE t1 (i int, j int);
INSERT INTO t1 VALUES (1,1),(2,2);
SELECT DISTINCT i, ELT(j, '345', '34') FROM t1;
i	ELT(j, '345', '34')
1	345
2	34
DROP TABLE t1;
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create table t1(a char(4));
insert into t1 values ('one'),(NULL),('two'),('four');
select a, quote(a), isnull(quote(a)), quote(a) is null, ifnull(quote(a), 'n') from t1;
a	quote(a)	isnull(quote(a))	quote(a) is null	ifnull(quote(a), 'n')
one	'one'	0	0	'one'
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NULL	NULL	0	0	NULL
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two	'two'	0	0	'two'
four	'four'	0	0	'four'
drop table t1;
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select trim(trailing 'foo' from 'foo');
trim(trailing 'foo' from 'foo')

select trim(leading 'foo' from 'foo');
trim(leading 'foo' from 'foo')
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select quote(ltrim(concat('    ', 'a')));
quote(ltrim(concat('    ', 'a')))
'a'
select quote(trim(concat('    ', 'a')));
quote(trim(concat('    ', 'a')))
'a'
CREATE TABLE t1 SELECT 1 UNION SELECT 2 UNION SELECT 3;
SELECT QUOTE('A') FROM t1;
QUOTE('A')
'A'
'A'
'A'
DROP TABLE t1;
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select 1=_latin1'1';
1=_latin1'1'
1
select _latin1'1'=1;
_latin1'1'=1
1
select _latin2'1'=1;
_latin2'1'=1
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select 1=_latin2'1';
1=_latin2'1'
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select _latin1'1'=_latin2'1';
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation '='
select row('a','b','c') = row('a','b','c');
row('a','b','c') = row('a','b','c')
1
select row('A','b','c') = row('a','b','c');
row('A','b','c') = row('a','b','c')
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select row('A' COLLATE latin1_bin,'b','c') = row('a','b','c');
row('A' COLLATE latin1_bin,'b','c') = row('a','b','c')
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select row('A','b','c') = row('a' COLLATE latin1_bin,'b','c');
row('A','b','c') = row('a' COLLATE latin1_bin,'b','c')
0
select row('A' COLLATE latin1_general_ci,'b','c') = row('a' COLLATE latin1_bin,'b','c');
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation '='
select concat(_latin1'a',_latin2'a');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat'
select concat(_latin1'a',_latin2'a',_latin5'a');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin5_turkish_ci,COERCIBLE) for operation 'concat'
select concat(_latin1'a',_latin2'a',_latin5'a',_latin7'a');
ERROR HY000: Illegal mix of collations for operation 'concat'
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select concat_ws(_latin1'a',_latin2'a');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'concat_ws'
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select FIELD('b','A','B');
FIELD('b','A','B')
2
select FIELD('B','A','B');
FIELD('B','A','B')
2
select FIELD('b' COLLATE latin1_bin,'A','B');
FIELD('b' COLLATE latin1_bin,'A','B')
0
select FIELD('b','A' COLLATE latin1_bin,'B');
FIELD('b','A' COLLATE latin1_bin,'B')
0
select FIELD(_latin2'b','A','B');
ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'field'
select FIELD('b',_latin2'A','B');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'field'
select FIELD('b',_latin2'A','B',1);
FIELD('b',_latin2'A','B',1)
1
select POSITION(_latin1'B' IN _latin1'abcd');
POSITION(_latin1'B' IN _latin1'abcd')
2
select POSITION(_latin1'B' IN _latin1'abcd' COLLATE latin1_bin);
POSITION(_latin1'B' IN _latin1'abcd' COLLATE latin1_bin)
0
select POSITION(_latin1'B' COLLATE latin1_bin IN _latin1'abcd');
POSITION(_latin1'B' COLLATE latin1_bin IN _latin1'abcd')
0
select POSITION(_latin1'B' COLLATE latin1_general_ci IN _latin1'abcd' COLLATE latin1_bin);
ERROR HY000: Illegal mix of collations (latin1_bin,EXPLICIT) and (latin1_general_ci,EXPLICIT) for operation 'locate'
select POSITION(_latin1'B' IN _latin2'abcd');
ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE) and (latin1_swedish_ci,COERCIBLE) for operation 'locate'
select FIND_IN_SET(_latin1'B',_latin1'a,b,c,d');
FIND_IN_SET(_latin1'B',_latin1'a,b,c,d')
2
select FIND_IN_SET(_latin1'B' COLLATE latin1_general_ci,_latin1'a,b,c,d' COLLATE latin1_bin);
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'find_in_set'
select FIND_IN_SET(_latin1'B',_latin2'a,b,c,d');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'find_in_set'
select SUBSTRING_INDEX(_latin1'abcdabcdabcd',_latin1'd',2);
SUBSTRING_INDEX(_latin1'abcdabcdabcd',_latin1'd',2)
abcdabc
select SUBSTRING_INDEX(_latin1'abcdabcdabcd',_latin2'd',2);
423
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE) and (latin2_general_ci,COERCIBLE) for operation 'substring_index'
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select SUBSTRING_INDEX(_latin1'abcdabcdabcd' COLLATE latin1_general_ci,_latin1'd' COLLATE latin1_bin,2);
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ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'substring_index'
select _latin1'B' between _latin1'a' and _latin1'c';
_latin1'B' between _latin1'a' and _latin1'c'
1
select _latin1'B' collate latin1_bin between _latin1'a' and _latin1'c';
_latin1'B' collate latin1_bin between _latin1'a' and _latin1'c'
0
select _latin1'B' between _latin1'a' collate latin1_bin and _latin1'c';
_latin1'B' between _latin1'a' collate latin1_bin and _latin1'c'
0
select _latin1'B' between _latin1'a' and _latin1'c' collate latin1_bin;
_latin1'B' between _latin1'a' and _latin1'c' collate latin1_bin
0
select _latin2'B' between _latin1'a' and _latin1'b';
ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'between'
select _latin1'B' between _latin2'a' and _latin1'b';
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'between'
select _latin1'B' between _latin1'a' and _latin2'b';
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation 'between'
select _latin1'B' collate latin1_general_ci between _latin1'a' collate latin1_bin and _latin1'b';
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation 'between'
select _latin1'B' in (_latin1'a',_latin1'b');
_latin1'B' in (_latin1'a',_latin1'b')
1
select _latin1'B' collate latin1_bin in (_latin1'a',_latin1'b');
_latin1'B' collate latin1_bin in (_latin1'a',_latin1'b')
0
select _latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b');
_latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b')
0
select _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin);
_latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin)
0
select _latin2'B' in (_latin1'a',_latin1'b');
ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
select _latin1'B' in (_latin2'a',_latin1'b');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
select _latin1'B' in (_latin1'a',_latin2'b');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation ' IN '
select _latin1'B' COLLATE latin1_general_ci in (_latin1'a' COLLATE latin1_bin,_latin1'b');
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
select _latin1'B' COLLATE latin1_general_ci in (_latin1'a',_latin1'b' COLLATE latin1_bin);
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_swedish_ci,COERCIBLE), (latin1_bin,EXPLICIT) for operation ' IN '
select collation(bin(130)), coercibility(bin(130));
collation(bin(130))	coercibility(bin(130))
latin1_swedish_ci	3
select collation(oct(130)), coercibility(oct(130));
collation(oct(130))	coercibility(oct(130))
latin1_swedish_ci	3
select collation(conv(130,16,10)), coercibility(conv(130,16,10));
collation(conv(130,16,10))	coercibility(conv(130,16,10))
latin1_swedish_ci	3
select collation(hex(130)), coercibility(hex(130));
collation(hex(130))	coercibility(hex(130))
latin1_swedish_ci	3
select collation(char(130)), coercibility(hex(130));
collation(char(130))	coercibility(hex(130))
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482
latin1_swedish_ci	3
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select collation(format(130,10)), coercibility(format(130,10));
collation(format(130,10))	coercibility(format(130,10))
latin1_swedish_ci	3
select collation(lcase(_latin2'a')), coercibility(lcase(_latin2'a'));
collation(lcase(_latin2'a'))	coercibility(lcase(_latin2'a'))
latin2_general_ci	3
select collation(ucase(_latin2'a')), coercibility(ucase(_latin2'a'));
collation(ucase(_latin2'a'))	coercibility(ucase(_latin2'a'))
latin2_general_ci	3
select collation(left(_latin2'a',1)), coercibility(left(_latin2'a',1));
collation(left(_latin2'a',1))	coercibility(left(_latin2'a',1))
latin2_general_ci	3
select collation(right(_latin2'a',1)), coercibility(right(_latin2'a',1));
collation(right(_latin2'a',1))	coercibility(right(_latin2'a',1))
latin2_general_ci	3
select collation(substring(_latin2'a',1,1)), coercibility(substring(_latin2'a',1,1));
collation(substring(_latin2'a',1,1))	coercibility(substring(_latin2'a',1,1))
latin2_general_ci	3
select collation(concat(_latin2'a',_latin2'b')), coercibility(concat(_latin2'a',_latin2'b'));
collation(concat(_latin2'a',_latin2'b'))	coercibility(concat(_latin2'a',_latin2'b'))
latin2_general_ci	3
select collation(lpad(_latin2'a',4,_latin2'b')), coercibility(lpad(_latin2'a',4,_latin2'b'));
collation(lpad(_latin2'a',4,_latin2'b'))	coercibility(lpad(_latin2'a',4,_latin2'b'))
latin2_general_ci	3
select collation(rpad(_latin2'a',4,_latin2'b')), coercibility(rpad(_latin2'a',4,_latin2'b'));
collation(rpad(_latin2'a',4,_latin2'b'))	coercibility(rpad(_latin2'a',4,_latin2'b'))
latin2_general_ci	3
select collation(concat_ws(_latin2'a',_latin2'b')), coercibility(concat_ws(_latin2'a',_latin2'b'));
collation(concat_ws(_latin2'a',_latin2'b'))	coercibility(concat_ws(_latin2'a',_latin2'b'))
latin2_general_ci	3
select collation(make_set(255,_latin2'a',_latin2'b',_latin2'c')), coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'));
collation(make_set(255,_latin2'a',_latin2'b',_latin2'c'))	coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'))
latin2_general_ci	3
select collation(export_set(255,_latin2'y',_latin2'n',_latin2' ')), coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '));
collation(export_set(255,_latin2'y',_latin2'n',_latin2' '))	coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '))
binary	3
select collation(trim(_latin2' a ')), coercibility(trim(_latin2' a '));
collation(trim(_latin2' a '))	coercibility(trim(_latin2' a '))
latin2_general_ci	3
select collation(ltrim(_latin2' a ')), coercibility(ltrim(_latin2' a '));
collation(ltrim(_latin2' a '))	coercibility(ltrim(_latin2' a '))
latin2_general_ci	3
select collation(rtrim(_latin2' a ')), coercibility(rtrim(_latin2' a '));
collation(rtrim(_latin2' a '))	coercibility(rtrim(_latin2' a '))
latin2_general_ci	3
select collation(trim(LEADING _latin2' ' FROM _latin2'a')), coercibility(trim(LEADING _latin2'a' FROM _latin2'a'));
collation(trim(LEADING _latin2' ' FROM _latin2'a'))	coercibility(trim(LEADING _latin2'a' FROM _latin2'a'))
latin2_general_ci	3
select collation(trim(TRAILING _latin2' ' FROM _latin2'a')), coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'));
collation(trim(TRAILING _latin2' ' FROM _latin2'a'))	coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'))
latin2_general_ci	3
select collation(trim(BOTH _latin2' ' FROM _latin2'a')), coercibility(trim(BOTH _latin2'a' FROM _latin2'a'));
collation(trim(BOTH _latin2' ' FROM _latin2'a'))	coercibility(trim(BOTH _latin2'a' FROM _latin2'a'))
latin2_general_ci	3
select collation(repeat(_latin2'a',10)), coercibility(repeat(_latin2'a',10));
collation(repeat(_latin2'a',10))	coercibility(repeat(_latin2'a',10))
latin2_general_ci	3
select collation(reverse(_latin2'ab')), coercibility(reverse(_latin2'ab'));
collation(reverse(_latin2'ab'))	coercibility(reverse(_latin2'ab'))
latin2_general_ci	3
select collation(quote(_latin2'ab')), coercibility(quote(_latin2'ab'));
collation(quote(_latin2'ab'))	coercibility(quote(_latin2'ab'))
latin2_general_ci	3
select collation(soundex(_latin2'ab')), coercibility(soundex(_latin2'ab'));
collation(soundex(_latin2'ab'))	coercibility(soundex(_latin2'ab'))
latin2_general_ci	3
select collation(substring(_latin2'ab',1)), coercibility(substring(_latin2'ab',1));
collation(substring(_latin2'ab',1))	coercibility(substring(_latin2'ab',1))
latin2_general_ci	3
select collation(insert(_latin2'abcd',2,3,_latin2'ef')), coercibility(insert(_latin2'abcd',2,3,_latin2'ef'));
collation(insert(_latin2'abcd',2,3,_latin2'ef'))	coercibility(insert(_latin2'abcd',2,3,_latin2'ef'))
latin2_general_ci	3
select collation(replace(_latin2'abcd',_latin2'b',_latin2'B')), coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'));
collation(replace(_latin2'abcd',_latin2'b',_latin2'B'))	coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'))
latin2_general_ci	3
select collation(encode('abcd','ab')), coercibility(encode('abcd','ab'));
collation(encode('abcd','ab'))	coercibility(encode('abcd','ab'))
binary	3
create table t1 
select
bin(130),
oct(130),
conv(130,16,10),
hex(130),
char(130),
format(130,10),
left(_latin2'a',1),
right(_latin2'a',1), 
lcase(_latin2'a'), 
ucase(_latin2'a'),
substring(_latin2'a',1,1),
concat(_latin2'a',_latin2'b'),
lpad(_latin2'a',4,_latin2'b'),
rpad(_latin2'a',4,_latin2'b'),
concat_ws(_latin2'a',_latin2'b'),
make_set(255,_latin2'a',_latin2'b',_latin2'c'),
export_set(255,_latin2'y',_latin2'n',_latin2' '),
trim(_latin2' a '),
ltrim(_latin2' a '),
rtrim(_latin2' a '),
trim(LEADING _latin2' ' FROM _latin2' a '),
trim(TRAILING _latin2' ' FROM _latin2' a '),
trim(BOTH _latin2' ' FROM _latin2' a '),
repeat(_latin2'a',10),
reverse(_latin2'ab'),
quote(_latin2'ab'),
soundex(_latin2'ab'),
substring(_latin2'ab',1),
insert(_latin2'abcd',2,3,_latin2'ef'),
replace(_latin2'abcd',_latin2'b',_latin2'B'),
encode('abcd','ab')
;
Warnings:
Warning	1265	Data truncated for column 'format(130,10)' at row 1
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
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  `bin(130)` varchar(64) NOT NULL default '',
  `oct(130)` varchar(64) NOT NULL default '',
  `conv(130,16,10)` varchar(64) NOT NULL default '',
  `hex(130)` varchar(6) NOT NULL default '',
  `char(130)` varchar(1) NOT NULL default '',
  `format(130,10)` varchar(4) NOT NULL default '',
  `left(_latin2'a',1)` varchar(1) character set latin2 NOT NULL default '',
  `right(_latin2'a',1)` varchar(1) character set latin2 NOT NULL default '',
  `lcase(_latin2'a')` varchar(1) character set latin2 NOT NULL default '',
  `ucase(_latin2'a')` varchar(1) character set latin2 NOT NULL default '',
  `substring(_latin2'a',1,1)` varchar(1) character set latin2 NOT NULL default '',
  `concat(_latin2'a',_latin2'b')` varchar(2) character set latin2 NOT NULL default '',
  `lpad(_latin2'a',4,_latin2'b')` varchar(4) character set latin2 NOT NULL default '',
  `rpad(_latin2'a',4,_latin2'b')` varchar(4) character set latin2 NOT NULL default '',
  `concat_ws(_latin2'a',_latin2'b')` varchar(1) character set latin2 NOT NULL default '',
  `make_set(255,_latin2'a',_latin2'b',_latin2'c')` varchar(5) character set latin2 NOT NULL default '',
  `export_set(255,_latin2'y',_latin2'n',_latin2' ')` varchar(127) character set latin2 NOT NULL default '',
  `trim(_latin2' a ')` varchar(3) character set latin2 NOT NULL default '',
  `ltrim(_latin2' a ')` varchar(3) character set latin2 NOT NULL default '',
  `rtrim(_latin2' a ')` varchar(3) character set latin2 NOT NULL default '',
  `trim(LEADING _latin2' ' FROM _latin2' a ')` varchar(3) character set latin2 NOT NULL default '',
  `trim(TRAILING _latin2' ' FROM _latin2' a ')` varchar(3) character set latin2 NOT NULL default '',
  `trim(BOTH _latin2' ' FROM _latin2' a ')` varchar(3) character set latin2 NOT NULL default '',
  `repeat(_latin2'a',10)` varchar(10) character set latin2 NOT NULL default '',
  `reverse(_latin2'ab')` varchar(2) character set latin2 NOT NULL default '',
  `quote(_latin2'ab')` varchar(6) character set latin2 NOT NULL default '',
  `soundex(_latin2'ab')` varchar(4) character set latin2 NOT NULL default '',
  `substring(_latin2'ab',1)` varchar(2) character set latin2 NOT NULL default '',
  `insert(_latin2'abcd',2,3,_latin2'ef')` varchar(6) character set latin2 NOT NULL default '',
  `replace(_latin2'abcd',_latin2'b',_latin2'B')` varchar(4) character set latin2 NOT NULL default '',
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  `encode('abcd','ab')` varbinary(4) NOT NULL default ''
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
select SUBSTR('abcdefg',3,2);
SUBSTR('abcdefg',3,2)
cd
select SUBSTRING('abcdefg',3,2);
SUBSTRING('abcdefg',3,2)
cd
select SUBSTR('abcdefg',-3,2) FROM DUAL;
SUBSTR('abcdefg',-3,2)
ef
select SUBSTR('abcdefg',-1,5) FROM DUAL;
SUBSTR('abcdefg',-1,5)
g
select SUBSTR('abcdefg',0,0) FROM DUAL;
SUBSTR('abcdefg',0,0)

select SUBSTR('abcdefg',-1,-1) FROM DUAL;
SUBSTR('abcdefg',-1,-1)

select SUBSTR('abcdefg',1,-1) FROM DUAL;
SUBSTR('abcdefg',1,-1)

create table t7 (s1 char);
select * from t7
where concat(s1 collate latin1_general_ci,s1 collate latin1_swedish_ci) = 'AA';
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'concat'
drop table t7;
select substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2),substring_index("1abcd;2abcd;3abcd;4abcd", ';', -2);
substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2)	substring_index("1abcd;2abcd;3abcd;4abcd", ';', -2)
1abcd;2abcd	3abcd;4abcd
explain extended select md5('hello'), sha('abc'), sha1('abc'), soundex(''), 'mood' sounds like 'mud', aes_decrypt(aes_encrypt('abc','1'),'1'),concat('*',space(5),'*'), reverse('abc'), rpad('a',4,'1'), lpad('a',4,'1'),  concat_ws(',','',NULL,'a'),make_set(255,_latin2'a',_latin2'b',_latin2'c'),elt(2,1),locate("a","b",2),format(130,10),char(0),conv(130,16,10),hex(130),binary 'HE', export_set(255,_latin2'y',_latin2'n',_latin2' '),FIELD('b' COLLATE latin1_bin,'A','B'),FIND_IN_SET(_latin1'B',_latin1'a,b,c,d'),collation(conv(130,16,10)), coercibility(conv(130,16,10)),length('\n\t\r\b\0\_\%\\'),bit_length('\n\t\r\b\0\_\%\\'),bit_length('\n\t\r\b\0\_\%\\'),concat('monty',' was here ','again'),length('hello'),char(ascii('h')),ord('h'),quote(1/0),crc32("123"),replace('aaaa','a','b'),insert('txs',2,1,'hi'),left(_latin2'a',1),right(_latin2'a',1),lcase(_latin2'a'),ucase(_latin2'a'),SUBSTR('abcdefg',3,2),substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2),trim(_latin2' a '),ltrim(_latin2' a '),rtrim(_latin2' a '), decode(encode(repeat("a",100000),"monty"),"monty");
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
Note	1003	select md5(_latin1'hello') AS `md5('hello')`,sha(_latin1'abc') AS `sha('abc')`,sha(_latin1'abc') AS `sha1('abc')`,soundex(_latin1'') AS `soundex('')`,(soundex(_latin1'mood') = soundex(_latin1'mud')) AS `'mood' sounds like 'mud'`,aes_decrypt(aes_encrypt(_latin1'abc',_latin1'1'),_latin1'1') AS `aes_decrypt(aes_encrypt('abc','1'),'1')`,concat(_latin1'*',repeat(_latin1' ',5),_latin1'*') AS `concat('*',space(5),'*')`,reverse(_latin1'abc') AS `reverse('abc')`,rpad(_latin1'a',4,_latin1'1') AS `rpad('a',4,'1')`,lpad(_latin1'a',4,_latin1'1') AS `lpad('a',4,'1')`,concat_ws(_latin1',',_latin1'',NULL,_latin1'a') AS `concat_ws(',','',NULL,'a')`,make_set(255,_latin2'a',_latin2'b',_latin2'c') AS `make_set(255,_latin2'a',_latin2'b',_latin2'c')`,elt(2,1) AS `elt(2,1)`,locate(_latin1'a',_latin1'b',2) AS `locate("a","b",2)`,format(130,10) AS `format(130,10)`,char(0) AS `char(0)`,conv(130,16,10) AS `conv(130,16,10)`,hex(130) AS `hex(130)`,cast(_latin1'HE' as char charset binary) AS `binary 'HE'`,export_set(255,_latin2'y',_latin2'n',_latin2' ') AS `export_set(255,_latin2'y',_latin2'n',_latin2' ')`,field((_latin1'b' collate latin1_bin),_latin1'A',_latin1'B') AS `FIELD('b' COLLATE latin1_bin,'A','B')`,find_in_set(_latin1'B',_latin1'a,b,c,d') AS `FIND_IN_SET(_latin1'B',_latin1'a,b,c,d')`,collation(conv(130,16,10)) AS `collation(conv(130,16,10))`,coercibility(conv(130,16,10)) AS `coercibility(conv(130,16,10))`,length(_latin1'\n	\r\0\\_\\%\\') AS `length('\n\t\r\b\0\_\%\\')`,bit_length(_latin1'\n	\r\0\\_\\%\\') AS `bit_length('\n\t\r\b\0\_\%\\')`,bit_length(_latin1'\n	\r\0\\_\\%\\') AS `bit_length('\n\t\r\b\0\_\%\\')`,concat(_latin1'monty',_latin1' was here ',_latin1'again') AS `concat('monty',' was here ','again')`,length(_latin1'hello') AS `length('hello')`,char(ascii(_latin1'h')) AS `char(ascii('h'))`,ord(_latin1'h') AS `ord('h')`,quote((1 / 0)) AS `quote(1/0)`,crc32(_latin1'123') AS `crc32("123")`,replace(_latin1'aaaa',_latin1'a',_latin1'b') AS `replace('aaaa','a','b')`,insert(_latin1'txs',2,1,_latin1'hi') AS `insert('txs',2,1,'hi')`,left(_latin2'a',1) AS `left(_latin2'a',1)`,right(_latin2'a',1) AS `right(_latin2'a',1)`,lcase(_latin2'a') AS `lcase(_latin2'a')`,ucase(_latin2'a') AS `ucase(_latin2'a')`,substr(_latin1'abcdefg',3,2) AS `SUBSTR('abcdefg',3,2)`,substring_index(_latin1'1abcd;2abcd;3abcd;4abcd',_latin1';',2) AS `substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2)`,trim(_latin2' a ') AS `trim(_latin2' a ')`,ltrim(_latin2' a ') AS `ltrim(_latin2' a ')`,rtrim(_latin2' a ') AS `rtrim(_latin2' a ')`,decode(encode(repeat(_latin1'a',100000))) AS `decode(encode(repeat("a",100000),"monty"),"monty")`
SELECT lpad(12345, 5, "#");
lpad(12345, 5, "#")
12345
SELECT conv(71, 10, 36), conv('1Z', 36, 10);
conv(71, 10, 36)	conv('1Z', 36, 10)
1Z	71
create table t1 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t1 values (1,'aaaaaaaaaa'), (2,'bbbbbbbbbb');
create table t2 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t2 values (1,'cccccccccc'), (2,'dddddddddd');
select substring(concat(t1.str, t2.str), 1, 15) "name" from t1, t2 
where t2.id=t1.id order by name;
name
aaaaaaaaaaccccc
bbbbbbbbbbddddd
drop table t1, t2;
create table t1 (c1 INT, c2 INT UNSIGNED);
insert into t1 values ('21474836461','21474836461');
Warnings:
Warning	1264	Out of range value adjusted for column 'c1' at row 1
Warning	1264	Out of range value adjusted for column 'c2' at row 1
insert into t1 values ('-21474836461','-21474836461');
Warnings:
Warning	1264	Out of range value adjusted for column 'c1' at row 1
Warning	1264	Out of range value adjusted for column 'c2' at row 1
show warnings;
Level	Code	Message
Warning	1264	Out of range value adjusted for column 'c1' at row 1
Warning	1264	Out of range value adjusted for column 'c2' at row 1
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ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_bin,EXPLICIT) for operation 'substr_index'
select _latin1'B' between _latin1'a' and _latin1'c';
_latin1'B' between _latin1'a' and _latin1'c'
1
select _latin1'B' collate latin1_bin between _latin1'a' and _latin1'c';
_latin1'B' collate latin1_bin between _latin1'a' and _latin1'c'
0
select _latin1'B' between _latin1'a' collate latin1_bin and _latin1'c';
_latin1'B' between _latin1'a' collate latin1_bin and _latin1'c'
0
select _latin1'B' between _latin1'a' and _latin1'c' collate latin1_bin;
_latin1'B' between _latin1'a' and _latin1'c' collate latin1_bin
0
select _latin2'B' between _latin1'a' and _latin1'b';
ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'between'
select _latin1'B' between _latin2'a' and _latin1'b';
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation 'between'
select _latin1'B' between _latin1'a' and _latin2'b';
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation 'between'
select _latin1'B' collate latin1_general_ci between _latin1'a' collate latin1_bin and _latin1'b';
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation 'between'
select _latin1'B' in (_latin1'a',_latin1'b');
_latin1'B' in (_latin1'a',_latin1'b')
1
select _latin1'B' collate latin1_bin in (_latin1'a',_latin1'b');
_latin1'B' collate latin1_bin in (_latin1'a',_latin1'b')
0
select _latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b');
_latin1'B' in (_latin1'a' collate latin1_bin,_latin1'b')
0
select _latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin);
_latin1'B' in (_latin1'a',_latin1'b' collate latin1_bin)
0
select _latin2'B' in (_latin1'a',_latin1'b');
ERROR HY000: Illegal mix of collations (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
select _latin1'B' in (_latin2'a',_latin1'b');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
select _latin1'B' in (_latin1'a',_latin2'b');
ERROR HY000: Illegal mix of collations (latin1_swedish_ci,COERCIBLE), (latin1_swedish_ci,COERCIBLE), (latin2_general_ci,COERCIBLE) for operation ' IN '
select _latin1'B' COLLATE latin1_general_ci in (_latin1'a' COLLATE latin1_bin,_latin1'b');
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_bin,EXPLICIT), (latin1_swedish_ci,COERCIBLE) for operation ' IN '
select _latin1'B' COLLATE latin1_general_ci in (_latin1'a',_latin1'b' COLLATE latin1_bin);
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_swedish_ci,COERCIBLE), (latin1_bin,EXPLICIT) for operation ' IN '
select collation(bin(130)), coercibility(bin(130));
collation(bin(130))	coercibility(bin(130))
741
latin1_swedish_ci	4
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select collation(oct(130)), coercibility(oct(130));
collation(oct(130))	coercibility(oct(130))
744
latin1_swedish_ci	4
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select collation(conv(130,16,10)), coercibility(conv(130,16,10));
collation(conv(130,16,10))	coercibility(conv(130,16,10))
747
latin1_swedish_ci	4
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select collation(hex(130)), coercibility(hex(130));
collation(hex(130))	coercibility(hex(130))
750
latin1_swedish_ci	4
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select collation(char(130)), coercibility(hex(130));
collation(char(130))	coercibility(hex(130))
753
latin1_swedish_ci	4
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select collation(format(130,10)), coercibility(format(130,10));
collation(format(130,10))	coercibility(format(130,10))
756
latin1_swedish_ci	4
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select collation(lcase(_latin2'a')), coercibility(lcase(_latin2'a'));
collation(lcase(_latin2'a'))	coercibility(lcase(_latin2'a'))
759
latin2_general_ci	4
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select collation(ucase(_latin2'a')), coercibility(ucase(_latin2'a'));
collation(ucase(_latin2'a'))	coercibility(ucase(_latin2'a'))
762
latin2_general_ci	4
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select collation(left(_latin2'a',1)), coercibility(left(_latin2'a',1));
collation(left(_latin2'a',1))	coercibility(left(_latin2'a',1))
765
latin2_general_ci	4
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select collation(right(_latin2'a',1)), coercibility(right(_latin2'a',1));
collation(right(_latin2'a',1))	coercibility(right(_latin2'a',1))
768
latin2_general_ci	4
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select collation(substring(_latin2'a',1,1)), coercibility(substring(_latin2'a',1,1));
collation(substring(_latin2'a',1,1))	coercibility(substring(_latin2'a',1,1))
771
latin2_general_ci	4
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select collation(concat(_latin2'a',_latin2'b')), coercibility(concat(_latin2'a',_latin2'b'));
collation(concat(_latin2'a',_latin2'b'))	coercibility(concat(_latin2'a',_latin2'b'))
774
latin2_general_ci	4
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select collation(lpad(_latin2'a',4,_latin2'b')), coercibility(lpad(_latin2'a',4,_latin2'b'));
collation(lpad(_latin2'a',4,_latin2'b'))	coercibility(lpad(_latin2'a',4,_latin2'b'))
777
latin2_general_ci	4
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select collation(rpad(_latin2'a',4,_latin2'b')), coercibility(rpad(_latin2'a',4,_latin2'b'));
collation(rpad(_latin2'a',4,_latin2'b'))	coercibility(rpad(_latin2'a',4,_latin2'b'))
780
latin2_general_ci	4
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select collation(concat_ws(_latin2'a',_latin2'b')), coercibility(concat_ws(_latin2'a',_latin2'b'));
collation(concat_ws(_latin2'a',_latin2'b'))	coercibility(concat_ws(_latin2'a',_latin2'b'))
783
latin2_general_ci	4
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select collation(make_set(255,_latin2'a',_latin2'b',_latin2'c')), coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'));
collation(make_set(255,_latin2'a',_latin2'b',_latin2'c'))	coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'))
786
latin2_general_ci	4
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select collation(export_set(255,_latin2'y',_latin2'n',_latin2' ')), coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '));
collation(export_set(255,_latin2'y',_latin2'n',_latin2' '))	coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '))
789
binary	4
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select collation(trim(_latin2' a ')), coercibility(trim(_latin2' a '));
collation(trim(_latin2' a '))	coercibility(trim(_latin2' a '))
792
latin2_general_ci	4
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select collation(ltrim(_latin2' a ')), coercibility(ltrim(_latin2' a '));
collation(ltrim(_latin2' a '))	coercibility(ltrim(_latin2' a '))
795
latin2_general_ci	4
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select collation(rtrim(_latin2' a ')), coercibility(rtrim(_latin2' a '));
collation(rtrim(_latin2' a '))	coercibility(rtrim(_latin2' a '))
798
latin2_general_ci	4
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select collation(trim(LEADING _latin2' ' FROM _latin2'a')), coercibility(trim(LEADING _latin2'a' FROM _latin2'a'));
collation(trim(LEADING _latin2' ' FROM _latin2'a'))	coercibility(trim(LEADING _latin2'a' FROM _latin2'a'))
801
latin2_general_ci	4
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select collation(trim(TRAILING _latin2' ' FROM _latin2'a')), coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'));
collation(trim(TRAILING _latin2' ' FROM _latin2'a'))	coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'))
804
latin2_general_ci	4
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select collation(trim(BOTH _latin2' ' FROM _latin2'a')), coercibility(trim(BOTH _latin2'a' FROM _latin2'a'));
collation(trim(BOTH _latin2' ' FROM _latin2'a'))	coercibility(trim(BOTH _latin2'a' FROM _latin2'a'))
807
latin2_general_ci	4
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select collation(repeat(_latin2'a',10)), coercibility(repeat(_latin2'a',10));
collation(repeat(_latin2'a',10))	coercibility(repeat(_latin2'a',10))
810
latin2_general_ci	4
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select collation(reverse(_latin2'ab')), coercibility(reverse(_latin2'ab'));
collation(reverse(_latin2'ab'))	coercibility(reverse(_latin2'ab'))
813
latin2_general_ci	4
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select collation(quote(_latin2'ab')), coercibility(quote(_latin2'ab'));
collation(quote(_latin2'ab'))	coercibility(quote(_latin2'ab'))
816
latin2_general_ci	4
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select collation(soundex(_latin2'ab')), coercibility(soundex(_latin2'ab'));
collation(soundex(_latin2'ab'))	coercibility(soundex(_latin2'ab'))
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latin2_general_ci	4
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select collation(substring(_latin2'ab',1)), coercibility(substring(_latin2'ab',1));
collation(substring(_latin2'ab',1))	coercibility(substring(_latin2'ab',1))
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latin2_general_ci	4
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select collation(insert(_latin2'abcd',2,3,_latin2'ef')), coercibility(insert(_latin2'abcd',2,3,_latin2'ef'));
collation(insert(_latin2'abcd',2,3,_latin2'ef'))	coercibility(insert(_latin2'abcd',2,3,_latin2'ef'))
825
latin2_general_ci	4
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select collation(replace(_latin2'abcd',_latin2'b',_latin2'B')), coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'));
collation(replace(_latin2'abcd',_latin2'b',_latin2'B'))	coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'))
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latin2_general_ci	4
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select collation(encode('abcd','ab')), coercibility(encode('abcd','ab'));
collation(encode('abcd','ab'))	coercibility(encode('abcd','ab'))
831
binary	4
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create table t1 
select
bin(130),
oct(130),
conv(130,16,10),
hex(130),
char(130),
format(130,10),
left(_latin2'a',1),
right(_latin2'a',1), 
lcase(_latin2'a'), 
ucase(_latin2'a'),
substring(_latin2'a',1,1),
concat(_latin2'a',_latin2'b'),
lpad(_latin2'a',4,_latin2'b'),
rpad(_latin2'a',4,_latin2'b'),
concat_ws(_latin2'a',_latin2'b'),
make_set(255,_latin2'a',_latin2'b',_latin2'c'),
export_set(255,_latin2'y',_latin2'n',_latin2' '),
trim(_latin2' a '),
ltrim(_latin2' a '),
rtrim(_latin2' a '),
trim(LEADING _latin2' ' FROM _latin2' a '),
trim(TRAILING _latin2' ' FROM _latin2' a '),
trim(BOTH _latin2' ' FROM _latin2' a '),
repeat(_latin2'a',10),
reverse(_latin2'ab'),
quote(_latin2'ab'),
soundex(_latin2'ab'),
substring(_latin2'ab',1),
insert(_latin2'abcd',2,3,_latin2'ef'),
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replace(_latin2'abcd',_latin2'b',_latin2'B'),
encode('abcd','ab')
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;
Warnings:
Warning	1265	Data truncated for column 'format(130,10)' at row 1
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `bin(130)` char(64) NOT NULL default '',
  `oct(130)` char(64) NOT NULL default '',
  `conv(130,16,10)` char(64) NOT NULL default '',
  `hex(130)` char(6) NOT NULL default '',
  `char(130)` char(1) NOT NULL default '',
  `format(130,10)` char(4) NOT NULL default '',
  `left(_latin2'a',1)` char(1) character set latin2 NOT NULL default '',
  `right(_latin2'a',1)` char(1) character set latin2 NOT NULL default '',
  `lcase(_latin2'a')` char(1) character set latin2 NOT NULL default '',
  `ucase(_latin2'a')` char(1) character set latin2 NOT NULL default '',
  `substring(_latin2'a',1,1)` char(1) character set latin2 NOT NULL default '',
  `concat(_latin2'a',_latin2'b')` char(2) character set latin2 NOT NULL default '',
  `lpad(_latin2'a',4,_latin2'b')` char(4) character set latin2 NOT NULL default '',
  `rpad(_latin2'a',4,_latin2'b')` char(4) character set latin2 NOT NULL default '',
  `concat_ws(_latin2'a',_latin2'b')` char(1) character set latin2 NOT NULL default '',
  `make_set(255,_latin2'a',_latin2'b',_latin2'c')` char(5) character set latin2 NOT NULL default '',
  `export_set(255,_latin2'y',_latin2'n',_latin2' ')` char(127) character set latin2 NOT NULL default '',
  `trim(_latin2' a ')` char(3) character set latin2 NOT NULL default '',
  `ltrim(_latin2' a ')` char(3) character set latin2 NOT NULL default '',
  `rtrim(_latin2' a ')` char(3) character set latin2 NOT NULL default '',
  `trim(LEADING _latin2' ' FROM _latin2' a ')` char(3) character set latin2 NOT NULL default '',
  `trim(TRAILING _latin2' ' FROM _latin2' a ')` char(3) character set latin2 NOT NULL default '',
  `trim(BOTH _latin2' ' FROM _latin2' a ')` char(3) character set latin2 NOT NULL default '',
  `repeat(_latin2'a',10)` char(10) character set latin2 NOT NULL default '',
  `reverse(_latin2'ab')` char(2) character set latin2 NOT NULL default '',
  `quote(_latin2'ab')` char(6) character set latin2 NOT NULL default '',
  `soundex(_latin2'ab')` char(4) character set latin2 NOT NULL default '',
  `substring(_latin2'ab',1)` char(2) character set latin2 NOT NULL default '',
  `insert(_latin2'abcd',2,3,_latin2'ef')` char(6) character set latin2 NOT NULL default '',
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  `replace(_latin2'abcd',_latin2'b',_latin2'B')` char(4) character set latin2 NOT NULL default '',
  `encode('abcd','ab')` binary(4) NOT NULL default ''
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
select SUBSTR('abcdefg',3,2);
SUBSTR('abcdefg',3,2)
cd
select SUBSTRING('abcdefg',3,2);
SUBSTRING('abcdefg',3,2)
cd
select SUBSTR('abcdefg',-3,2) FROM DUAL;
SUBSTR('abcdefg',-3,2)
ef
select SUBSTR('abcdefg',-1,5) FROM DUAL;
SUBSTR('abcdefg',-1,5)
g
select SUBSTR('abcdefg',0,0) FROM DUAL;
SUBSTR('abcdefg',0,0)

select SUBSTR('abcdefg',-1,-1) FROM DUAL;
SUBSTR('abcdefg',-1,-1)

select SUBSTR('abcdefg',1,-1) FROM DUAL;
SUBSTR('abcdefg',1,-1)

create table t7 (s1 char);
select * from t7
where concat(s1 collate latin1_general_ci,s1 collate latin1_swedish_ci) = 'AA';
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT) and (latin1_swedish_ci,EXPLICIT) for operation 'concat'
drop table t7;
select substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2),substring_index("1abcd;2abcd;3abcd;4abcd", ';', -2);
substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2)	substring_index("1abcd;2abcd;3abcd;4abcd", ';', -2)
1abcd;2abcd	3abcd;4abcd
explain extended select md5('hello'), sha('abc'), sha1('abc'), soundex(''), 'mood' sounds like 'mud', aes_decrypt(aes_encrypt('abc','1'),'1'),concat('*',space(5),'*'), reverse('abc'), rpad('a',4,'1'), lpad('a',4,'1'),  concat_ws(',','',NULL,'a'),make_set(255,_latin2'a',_latin2'b',_latin2'c'),elt(2,1),locate("a","b",2),format(130,10),char(0),conv(130,16,10),hex(130),binary 'HE', export_set(255,_latin2'y',_latin2'n',_latin2' '),FIELD('b' COLLATE latin1_bin,'A','B'),FIND_IN_SET(_latin1'B',_latin1'a,b,c,d'),collation(conv(130,16,10)), coercibility(conv(130,16,10)),length('\n\t\r\b\0\_\%\\'),bit_length('\n\t\r\b\0\_\%\\'),bit_length('\n\t\r\b\0\_\%\\'),concat('monty',' was here ','again'),length('hello'),char(ascii('h')),ord('h'),quote(1/0),crc32("123"),replace('aaaa','a','b'),insert('txs',2,1,'hi'),left(_latin2'a',1),right(_latin2'a',1),lcase(_latin2'a'),ucase(_latin2'a'),SUBSTR('abcdefg',3,2),substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2),trim(_latin2' a '),ltrim(_latin2' a '),rtrim(_latin2' a '), decode(encode(repeat("a",100000),"monty"),"monty");
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
Warnings:
937
Note	1003	select md5(_latin1'hello') AS `md5('hello')`,sha(_latin1'abc') AS `sha('abc')`,sha(_latin1'abc') AS `sha1('abc')`,soundex(_latin1'') AS `soundex('')`,(soundex(_latin1'mood') = soundex(_latin1'mud')) AS `'mood' sounds like 'mud'`,aes_decrypt(aes_encrypt(_latin1'abc',_latin1'1'),_latin1'1') AS `aes_decrypt(aes_encrypt('abc','1'),'1')`,concat(_latin1'*',repeat(_latin1' ',5),_latin1'*') AS `concat('*',space(5),'*')`,reverse(_latin1'abc') AS `reverse('abc')`,rpad(_latin1'a',4,_latin1'1') AS `rpad('a',4,'1')`,lpad(_latin1'a',4,_latin1'1') AS `lpad('a',4,'1')`,concat_ws(_latin1',',_latin1'',NULL,_latin1'a') AS `concat_ws(',','',NULL,'a')`,make_set(255,_latin2'a',_latin2'b',_latin2'c') AS `make_set(255,_latin2'a',_latin2'b',_latin2'c')`,elt(2,1) AS `elt(2,1)`,locate(_latin1'a',_latin1'b',2) AS `locate("a","b",2)`,format(130,10) AS `format(130,10)`,char(0) AS `char(0)`,conv(130,16,10) AS `conv(130,16,10)`,hex(130) AS `hex(130)`,cast(_latin1'HE' as char charset binary) AS `binary 'HE'`,export_set(255,_latin2'y',_latin2'n',_latin2' ') AS `export_set(255,_latin2'y',_latin2'n',_latin2' ')`,field((_latin1'b' collate _latin1'latin1_bin'),_latin1'A',_latin1'B') AS `FIELD('b' COLLATE latin1_bin,'A','B')`,find_in_set(_latin1'B',_latin1'a,b,c,d') AS `FIND_IN_SET(_latin1'B',_latin1'a,b,c,d')`,collation(conv(130,16,10)) AS `collation(conv(130,16,10))`,coercibility(conv(130,16,10)) AS `coercibility(conv(130,16,10))`,length(_latin1'\n	\r\0\\_\\%\\') AS `length('\n\t\r\b\0\_\%\\')`,bit_length(_latin1'\n	\r\0\\_\\%\\') AS `bit_length('\n\t\r\b\0\_\%\\')`,bit_length(_latin1'\n	\r\0\\_\\%\\') AS `bit_length('\n\t\r\b\0\_\%\\')`,concat(_latin1'monty',_latin1' was here ',_latin1'again') AS `concat('monty',' was here ','again')`,length(_latin1'hello') AS `length('hello')`,char(ascii(_latin1'h')) AS `char(ascii('h'))`,ord(_latin1'h') AS `ord('h')`,quote((1 / 0)) AS `quote(1/0)`,crc32(_latin1'123') AS `crc32("123")`,replace(_latin1'aaaa',_latin1'a',_latin1'b') AS `replace('aaaa','a','b')`,insert(_latin1'txs',2,1,_latin1'hi') AS `insert('txs',2,1,'hi')`,left(_latin2'a',1) AS `left(_latin2'a',1)`,right(_latin2'a',1) AS `right(_latin2'a',1)`,lcase(_latin2'a') AS `lcase(_latin2'a')`,ucase(_latin2'a') AS `ucase(_latin2'a')`,substr(_latin1'abcdefg',3,2) AS `SUBSTR('abcdefg',3,2)`,substr_index(_latin1'1abcd;2abcd;3abcd;4abcd',_latin1';',2) AS `substring_index("1abcd;2abcd;3abcd;4abcd", ';', 2)`,trim(_latin2' a ') AS `trim(_latin2' a ')`,ltrim(_latin2' a ') AS `ltrim(_latin2' a ')`,rtrim(_latin2' a ') AS `rtrim(_latin2' a ')`,decode(encode(repeat(_latin1'a',100000))) AS `decode(encode(repeat("a",100000),"monty"),"monty")`
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SELECT lpad(12345, 5, "#");
lpad(12345, 5, "#")
12345
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SELECT conv(71, 10, 36), conv('1Z', 36, 10);
conv(71, 10, 36)	conv('1Z', 36, 10)
1Z	71
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create table t1 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t1 values (1,'aaaaaaaaaa'), (2,'bbbbbbbbbb');
create table t2 (id int(1), str varchar(10)) DEFAULT CHARSET=utf8;
insert into t2 values (1,'cccccccccc'), (2,'dddddddddd');
select substring(concat(t1.str, t2.str), 1, 15) "name" from t1, t2 
where t2.id=t1.id order by name;
name
aaaaaaaaaaccccc
bbbbbbbbbbddddd
drop table t1, t2;
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create table t1 (c1 INT, c2 INT UNSIGNED);
insert into t1 values ('21474836461','21474836461');
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Warnings:
Warning	1265	Data truncated for column 'c1' at row 1
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Warning	1265	Data truncated for column 'c2' at row 1
insert into t1 values ('-21474836461','-21474836461');
Warnings:
Warning	1265	Data truncated for column 'c1' at row 1
Warning	1265	Data truncated for column 'c2' at row 1
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show warnings;
Level	Code	Message
Warning	1265	Data truncated for column 'c1' at row 1
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Warning	1265	Data truncated for column 'c2' at row 1
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select * from t1;
c1	c2
2147483647	4294967295
-2147483648	0
drop table t1;
select left(1234, 3) + 0;
left(1234, 3) + 0
123
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create table t1 (a int not null primary key, b varchar(40), c datetime);
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insert into t1 (a,b,c) values (1,'Tom','2004-12-10 12:13:14'),(2,'ball games','2004-12-10 12:13:14'), (3,'Basil','2004-12-10 12:13:14'), (4,'Dean','2004-12-10 12:13:14'),(5,'Ellis','2004-12-10 12:13:14'), (6,'Serg','2004-12-10 12:13:14'), (7,'Sergei','2004-12-10 12:13:14'),(8,'Georg','2004-12-10 12:13:14'),(9,'Salle','2004-12-10 12:13:14'),(10,'Sinisa','2004-12-10 12:13:14');
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select count(*) as total, left(c,10) as reg from t1 group by reg order by reg desc limit 0,12;
total	reg
10	2004-12-10
drop table t1;
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select trim(null from 'kate') as "must_be_null";
must_be_null
NULL
select trim('xyz' from null) as "must_be_null";
must_be_null
NULL
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select trim(leading NULL from 'kate') as "must_be_null";
must_be_null
NULL
select trim(trailing NULL from 'xyz') as "must_be_null";
must_be_null
NULL
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CREATE TABLE t1 (
id int(11) NOT NULL auto_increment,
a bigint(20) unsigned default NULL,
PRIMARY KEY  (id)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES
('0','16307858876001849059');
SELECT CONV('e251273eb74a8ee3', 16, 10);
CONV('e251273eb74a8ee3', 16, 10)
16307858876001849059
EXPLAIN 
SELECT id
FROM t1
WHERE a = 16307858876001849059;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
EXPLAIN 
SELECT id
FROM t1
WHERE a = CONV('e251273eb74a8ee3', 16, 10);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
DROP TABLE t1;
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SELECT CHAR(NULL,121,83,81,'76') as my_column;
my_column
ySQL
SELECT CHAR_LENGTH(CHAR(NULL,121,83,81,'76')) as my_column;
my_column
4