Commit fac17473 authored by unknown's avatar unknown

manual.texi More keyword capping.


Docs/manual.texi:
  More keyword capping.
parent a0418147
......@@ -27921,7 +27921,7 @@ mysql> SELECT x'FF'
-> 255
mysql> SELECT 0xa+0;
-> 10
mysql> select 0x5061756c;
mysql> SELECT 0x5061756c;
-> Paul
@end example
......@@ -30263,13 +30263,13 @@ Logical NOT. Returns @code{1} if the argument is @code{0}, otherwise returns
@code{0}.
Exception: @code{NOT NULL} returns @code{NULL}:
@example
mysql> select NOT 1;
mysql> SELECT NOT 1;
-> 0
mysql> select NOT NULL;
mysql> SELECT NOT NULL;
-> NULL
mysql> select ! (1+1);
mysql> SELECT ! (1+1);
-> 0
mysql> select ! 1+1;
mysql> SELECT ! 1+1;
-> 1
@end example
The last example returns @code{1} because the expression evaluates
......@@ -30282,11 +30282,11 @@ the same way as @code{(!1)+1}.
Logical OR. Returns @code{1} if either argument is not @code{0} and not
@code{NULL}:
@example
mysql> select 1 || 0;
mysql> SELECT 1 || 0;
-> 1
mysql> select 0 || 0;
mysql> SELECT 0 || 0;
-> 0
mysql> select 1 || NULL;
mysql> SELECT 1 || NULL;
-> 1
@end example
......@@ -30298,9 +30298,9 @@ mysql> select 1 || NULL;
Logical AND. Returns @code{0} if either argument is @code{0} or @code{NULL},
otherwise returns @code{1}:
@example
mysql> select 1 && NULL;
mysql> SELECT 1 && NULL;
-> 0
mysql> select 1 && 0;
mysql> SELECT 1 && 0;
-> 0
@end example
@end table
......@@ -30320,13 +30320,13 @@ If @code{expr1} is not @code{NULL}, @code{IFNULL()} returns @code{expr1},
else it returns @code{expr2}. @code{IFNULL()} returns a numeric or string
value, depending on the context in which it is used:
@example
mysql> select IFNULL(1,0);
mysql> SELECT IFNULL(1,0);
-> 1
mysql> select IFNULL(NULL,10);
mysql> SELECT IFNULL(NULL,10);
-> 10
mysql> select IFNULL(1/0,10);
mysql> SELECT IFNULL(1/0,10);
-> 10
mysql> select IFNULL(1/0,'yes');
mysql> SELECT IFNULL(1/0,'yes');
-> 'yes'
@end example
......@@ -30335,9 +30335,9 @@ mysql> select IFNULL(1/0,'yes');
If @code{expr1 = expr2} is true, return @code{NULL} else return @code{expr1}.
This is the same as @code{CASE WHEN x = y THEN NULL ELSE x END}:
@example
mysql> select NULLIF(1,1);
mysql> SELECT NULLIF(1,1);
-> NULL
mysql> select NULLIF(1,2);
mysql> SELECT NULLIF(1,2);
-> 1
@end example
......@@ -30352,11 +30352,11 @@ If @code{expr1} is TRUE (@code{expr1 <> 0} and @code{expr1 <> NULL}) then
in which it is used:
@example
mysql> select IF(1>2,2,3);
mysql> SELECT IF(1>2,2,3);
-> 3
mysql> select IF(1<2,'yes','no');
mysql> SELECT IF(1<2,'yes','no');
-> 'yes'
mysql> select IF(strcmp('test','test1'),'no','yes');
mysql> SELECT IF(STRCMP('test','test1'),'no','yes');
-> 'no'
@end example
......@@ -30365,9 +30365,9 @@ testing floating-point or string values, you should do so using a comparison
operation:
@example
mysql> select IF(0.1,1,0);
mysql> SELECT IF(0.1,1,0);
-> 0
mysql> select IF(0.1<>0,1,0);
mysql> SELECT IF(0.1<>0,1,0);
-> 1
@end example
......@@ -30435,11 +30435,11 @@ Returns the ASCII code value of the leftmost character of the string
@code{NULL} if @code{str} is @code{NULL}:
@example
mysql> select ASCII('2');
mysql> SELECT ASCII('2');
-> 50
mysql> select ASCII(2);
mysql> SELECT ASCII(2);
-> 50
mysql> select ASCII('dx');
mysql> SELECT ASCII('dx');
-> 100
@end example
......@@ -30455,7 +30455,7 @@ If the leftmost character is not a multi-byte character, returns the same
value that the @code{ASCII()} function does:
@example
mysql> select ORD('2');
mysql> SELECT ORD('2');
-> 50
@end example
......@@ -30471,13 +30471,13 @@ signed number. Otherwise, @code{N} is treated as unsigned. @code{CONV} works
with 64-bit precision:
@example
mysql> select CONV("a",16,2);
mysql> SELECT CONV("a",16,2);
-> '1010'
mysql> select CONV("6E",18,8);
mysql> SELECT CONV("6E",18,8);
-> '172'
mysql> select CONV(-17,10,-18);
mysql> SELECT CONV(-17,10,-18);
-> '-H'
mysql> select CONV(10+"10"+'10'+0xa,10,10);
mysql> SELECT CONV(10+"10"+'10'+0xa,10,10);
-> '40'
@end example
......@@ -30488,7 +30488,7 @@ Returns a string representation of the binary value of @code{N}, where
@code{CONV(N,10,2)}. Returns @code{NULL} if @code{N} is @code{NULL}:
@example
mysql> select BIN(12);
mysql> SELECT BIN(12);
-> '1100'
@end example
......@@ -30499,7 +30499,7 @@ Returns a string representation of the octal value of @code{N}, where
Returns @code{NULL} if @code{N} is @code{NULL}:
@example
mysql> select OCT(12);
mysql> SELECT OCT(12);
-> '14'
@end example
......@@ -30515,11 +30515,11 @@ character in N_OR_S is converted to 2 hexadecimal digits. This is the
invers of the @code{0xff} strings.
@example
mysql> select HEX(255);
mysql> SELECT HEX(255);
-> 'FF'
mysql> select HEX("abc");
mysql> SELECT HEX("abc");
-> 616263
mysql> select 0x616263;
mysql> SELECT 0x616263;
-> "abc"
@end example
......@@ -30530,9 +30530,9 @@ consisting of the characters given by the ASCII code values of those
integers. @code{NULL} values are skipped:
@example
mysql> select CHAR(77,121,83,81,'76');
mysql> SELECT CHAR(77,121,83,81,'76');
-> 'MySQL'
mysql> select CHAR(77,77.3,'77.3');
mysql> SELECT CHAR(77,77.3,'77.3');
-> 'MMM'
@end example
......@@ -30543,11 +30543,11 @@ Returns the string that results from concatenating the arguments. Returns
A numeric argument is converted to the equivalent string form:
@example
mysql> select CONCAT('My', 'S', 'QL');
mysql> SELECT CONCAT('My', 'S', 'QL');
-> 'MySQL'
mysql> select CONCAT('My', NULL, 'QL');
mysql> SELECT CONCAT('My', NULL, 'QL');
-> NULL
mysql> select CONCAT(14.3);
mysql> SELECT CONCAT(14.3);
-> '14.3'
@end example
......@@ -30563,9 +30563,9 @@ separator argument. The separator will be added between the strings to be
concatenated:
@example
mysql> select CONCAT_WS(",","First name","Second name","Last Name");
mysql> SELECT CONCAT_WS(",","First name","Second name","Last Name");
-> 'First name,Second name,Last Name'
mysql> select CONCAT_WS(",","First name",NULL,"Last Name");
mysql> SELECT CONCAT_WS(",","First name",NULL,"Last Name");
-> 'First name,Last Name'
@end example
......@@ -30580,9 +30580,9 @@ mysql> select CONCAT_WS(",","First name",NULL,"Last Name");
Returns the length of the string @code{str}:
@example
mysql> select LENGTH('text');
mysql> SELECT LENGTH('text');
-> 4
mysql> select OCTET_LENGTH('text');
mysql> SELECT OCTET_LENGTH('text');
-> 4
@end example
......@@ -30594,7 +30594,7 @@ characters are only counted once.
Returns the length of the string @code{str} in bits:
@example
mysql> select BIT_LENGTH('text');
mysql> SELECT BIT_LENGTH('text');
-> 32
@end example
......@@ -30606,9 +30606,9 @@ Returns the position of the first occurrence of substring @code{substr}
in string @code{str}. Returns @code{0} if @code{substr} is not in @code{str}:
@example
mysql> select LOCATE('bar', 'foobarbar');
mysql> SELECT LOCATE('bar', 'foobarbar');
-> 4
mysql> select LOCATE('xbar', 'foobar');
mysql> SELECT LOCATE('xbar', 'foobar');
-> 0
@end example
......@@ -30623,7 +30623,7 @@ string @code{str}, starting at position @code{pos}.
Returns @code{0} if @code{substr} is not in @code{str}:
@example
mysql> select LOCATE('bar', 'foobarbar',5);
mysql> SELECT LOCATE('bar', 'foobarbar',5);
-> 7
@end example
......@@ -30638,9 +30638,9 @@ string @code{str}. This is the same as the two-argument form of
@code{LOCATE()}, except that the arguments are swapped:
@example
mysql> select INSTR('foobarbar', 'bar');
mysql> SELECT INSTR('foobarbar', 'bar');
-> 4
mysql> select INSTR('xbar', 'foobar');
mysql> SELECT INSTR('xbar', 'foobar');
-> 0
@end example
......@@ -30655,7 +30655,7 @@ until @code{str} is @code{len} characters long. If @code{str} is longer
than @code{len'} then it will be shortened to @code{len} characters.
@example
mysql> select LPAD('hi',4,'??');
mysql> SELECT LPAD('hi',4,'??');
-> '??hi'
@end example
......@@ -30667,7 +30667,7 @@ Returns the string @code{str}, right-padded with the string
@code{len} characters.
@example
mysql> select RPAD('hi',5,'?');
mysql> SELECT RPAD('hi',5,'?');
-> 'hi???'
@end example
......@@ -30676,7 +30676,7 @@ mysql> select RPAD('hi',5,'?');
Returns the leftmost @code{len} characters from the string @code{str}:
@example
mysql> select LEFT('foobarbar', 5);
mysql> SELECT LEFT('foobarbar', 5);
-> 'fooba'
@end example
......@@ -30687,7 +30687,7 @@ This function is multi-byte safe.
Returns the rightmost @code{len} characters from the string @code{str}:
@example
mysql> select RIGHT('foobarbar', 4);
mysql> SELECT RIGHT('foobarbar', 4);
-> 'rbar'
@end example
......@@ -30703,7 +30703,7 @@ starting at position @code{pos}.
The variant form that uses @code{FROM} is ANSI SQL92 syntax:
@example
mysql> select SUBSTRING('Quadratically',5,6);
mysql> SELECT SUBSTRING('Quadratically',5,6);
-> 'ratica'
@end example
......@@ -30715,9 +30715,9 @@ This function is multi-byte safe.
Returns a substring from string @code{str} starting at position @code{pos}:
@example
mysql> select SUBSTRING('Quadratically',5);
mysql> SELECT SUBSTRING('Quadratically',5);
-> 'ratically'
mysql> select SUBSTRING('foobarbar' FROM 4);
mysql> SELECT SUBSTRING('foobarbar' FROM 4);
-> 'barbar'
@end example
......@@ -30733,9 +30733,9 @@ If @code{count} is negative, everything to the right of the final delimiter
(counting from the right) is returned:
@example
mysql> select SUBSTRING_INDEX('www.mysql.com', '.', 2);
mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 2);
-> 'www.mysql'
mysql> select SUBSTRING_INDEX('www.mysql.com', '.', -2);
mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2);
-> 'mysql.com'
@end example
......@@ -30746,7 +30746,7 @@ This function is multi-byte safe.
Returns the string @code{str} with leading space characters removed:
@example
mysql> select LTRIM(' barbar');
mysql> SELECT LTRIM(' barbar');
-> 'barbar'
@end example
......@@ -30755,7 +30755,7 @@ mysql> select LTRIM(' barbar');
Returns the string @code{str} with trailing space characters removed:
@example
mysql> select RTRIM('barbar ');
mysql> SELECT RTRIM('barbar ');
-> 'barbar'
@end example
......@@ -30769,13 +30769,13 @@ removed. If none of the specifiers @code{BOTH}, @code{LEADING} or
specified, spaces are removed:
@example
mysql> select TRIM(' bar ');
mysql> SELECT TRIM(' bar ');
-> 'bar'
mysql> select TRIM(LEADING 'x' FROM 'xxxbarxxx');
mysql> SELECT TRIM(LEADING 'x' FROM 'xxxbarxxx');
-> 'barxxx'
mysql> select TRIM(BOTH 'x' FROM 'xxxbarxxx');
mysql> SELECT TRIM(BOTH 'x' FROM 'xxxbarxxx');
-> 'bar'
mysql> select TRIM(TRAILING 'xyz' FROM 'barxxyz');
mysql> SELECT TRIM(TRAILING 'xyz' FROM 'barxxyz');
-> 'barx'
@end example
......@@ -30792,9 +30792,9 @@ in the given string. All international alpha characters outside the A-Z range
are treated as vowels:
@example
mysql> select SOUNDEX('Hello');
mysql> SELECT SOUNDEX('Hello');
-> 'H400'
mysql> select SOUNDEX('Quadratically');
mysql> SELECT SOUNDEX('Quadratically');
-> 'Q36324'
@end example
......@@ -30803,7 +30803,7 @@ mysql> select SOUNDEX('Quadratically');
Returns a string consisting of @code{N} space characters:
@example
mysql> select SPACE(6);
mysql> SELECT SPACE(6);
-> ' '
@end example
......@@ -30813,7 +30813,7 @@ Returns the string @code{str} with all all occurrences of the string
@code{from_str} replaced by the string @code{to_str}:
@example
mysql> select REPLACE('www.mysql.com', 'w', 'Ww');
mysql> SELECT REPLACE('www.mysql.com', 'w', 'Ww');
-> 'WwWwWw.mysql.com'
@end example
......@@ -30826,7 +30826,7 @@ times. If @code{count <= 0}, returns an empty string. Returns @code{NULL} if
@code{str} or @code{count} are @code{NULL}:
@example
mysql> select REPEAT('MySQL', 3);
mysql> SELECT REPEAT('MySQL', 3);
-> 'MySQLMySQLMySQL'
@end example
......@@ -30835,7 +30835,7 @@ mysql> select REPEAT('MySQL', 3);
Returns the string @code{str} with the order of the characters reversed:
@example
mysql> select REVERSE('abc');
mysql> SELECT REVERSE('abc');
-> 'cba'
@end example
......@@ -30848,7 +30848,7 @@ Returns the string @code{str}, with the substring beginning at position
@code{newstr}:
@example
mysql> select INSERT('Quadratic', 3, 4, 'What');
mysql> SELECT INSERT('Quadratic', 3, 4, 'What');
-> 'QuWhattic'
@end example
......@@ -30862,9 +30862,9 @@ or greater than the number of arguments. @code{ELT()} is the complement of
@code{FIELD()}:
@example
mysql> select ELT(1, 'ej', 'Heja', 'hej', 'foo');
mysql> SELECT ELT(1, 'ej', 'Heja', 'hej', 'foo');
-> 'ej'
mysql> select ELT(4, 'ej', 'Heja', 'hej', 'foo');
mysql> SELECT ELT(4, 'ej', 'Heja', 'hej', 'foo');
-> 'foo'
@end example
......@@ -30876,9 +30876,9 @@ Returns @code{0} if @code{str} is not found.
@code{FIELD()} is the complement of @code{ELT()}:
@example
mysql> select FIELD('ej', 'Hej', 'ej', 'Heja', 'hej', 'foo');
mysql> SELECT FIELD('ej', 'Hej', 'ej', 'Heja', 'hej', 'foo');
-> 2
mysql> select FIELD('fo', 'Hej', 'ej', 'Heja', 'hej', 'foo');
mysql> SELECT FIELD('fo', 'Hej', 'ej', 'Heja', 'hej', 'foo');
-> 0
@end example
......@@ -30924,7 +30924,7 @@ with 'separator' (default ',') and only 'number_of_bits' (default 64) of
'bits' is used:
@example
mysql> select EXPORT_SET(5,'Y','N',',',4)
mysql> SELECT EXPORT_SET(5,'Y','N',',',4)
-> Y,N,Y,N
@end example
......@@ -30937,7 +30937,7 @@ according to the current character set mapping (the default is ISO-8859-1
Latin1):
@example
mysql> select LCASE('QUADRATICALLY');
mysql> SELECT LCASE('QUADRATICALLY');
-> 'quadratically'
@end example
......@@ -30952,7 +30952,7 @@ according to the current character set mapping (the default is ISO-8859-1
Latin1):
@example
mysql> select UCASE('Hej');
mysql> SELECT UCASE('Hej');
-> 'HEJ'
@end example
......@@ -30970,7 +30970,7 @@ If the file doesn't exist or can't be read due to one of the above reasons,
the function returns @code{NULL}:
@example
mysql> UPDATE table_name
mysql> UPDATE tbl_name
SET blob_column=LOAD_FILE("/tmp/picture")
WHERE id=1;
@end example
......@@ -31032,9 +31032,9 @@ in the pattern:
@end multitable
@example
mysql> select 'David!' LIKE 'David_';
mysql> SELECT 'David!' LIKE 'David_';
-> 1
mysql> select 'David!' LIKE '%D%v%';
mysql> SELECT 'David!' LIKE '%D%v%';
-> 1
@end example
......@@ -31049,16 +31049,16 @@ with the escape character. If you don't specify the @code{ESCAPE} character,
@end multitable
@example
mysql> select 'David!' LIKE 'David\_';
mysql> SELECT 'David!' LIKE 'David\_';
-> 0
mysql> select 'David_' LIKE 'David\_';
mysql> SELECT 'David_' LIKE 'David\_';
-> 1
@end example
To specify a different escape character, use the @code{ESCAPE} clause:
@example
mysql> select 'David_' LIKE 'David|_' ESCAPE '|';
mysql> SELECT 'David_' LIKE 'David|_' ESCAPE '|';
-> 1
@end example
......@@ -31066,7 +31066,7 @@ The following two statements illustrate that string comparisons are
case insensitive unless one of the operands is a binary string:
@example
mysql> select 'abc' LIKE 'ABC';
mysql> SELECT 'abc' LIKE 'ABC';
-> 1
mysql> SELECT 'abc' LIKE BINARY 'ABC';
-> 0
......@@ -31076,7 +31076,7 @@ mysql> SELECT 'abc' LIKE BINARY 'ABC';
extension to the ANSI SQL @code{LIKE}.)
@example
mysql> select 10 LIKE '1%';
mysql> SELECT 10 LIKE '1%';
-> 1
@end example
......@@ -31107,15 +31107,15 @@ you use in your @code{REGEXP} strings. As of MySQL Version 3.23.4,
@code{REGEXP} is case insensitive for normal (not binary) strings:
@example
mysql> select 'Monty!' REGEXP 'm%y%%';
mysql> SELECT 'Monty!' REGEXP 'm%y%%';
-> 0
mysql> select 'Monty!' REGEXP '.*';
mysql> SELECT 'Monty!' REGEXP '.*';
-> 1
mysql> select 'new*\n*line' REGEXP 'new\\*.\\*line';
mysql> SELECT 'new*\n*line' REGEXP 'new\\*.\\*line';
-> 1
mysql> select "a" REGEXP "A", "a" REGEXP BINARY "A";
mysql> SELECT "a" REGEXP "A", "a" REGEXP BINARY "A";
-> 1 0
mysql> select "a" REGEXP "^[a-d]";
mysql> SELECT "a" REGEXP "^[a-d]";
-> 1
@end example
......@@ -31136,11 +31136,11 @@ argument is smaller than the second according to the current sort order,
and @code{1} otherwise:
@example
mysql> select STRCMP('text', 'text2');
mysql> SELECT STRCMP('text', 'text2');
-> -1
mysql> select STRCMP('text2', 'text');
mysql> SELECT STRCMP('text2', 'text');
-> 1
mysql> select STRCMP('text', 'text');
mysql> SELECT STRCMP('text', 'text');
-> 0
@end example
......@@ -31171,9 +31171,9 @@ The @code{BINARY} operator casts the string following it to a binary string.
This is an easy way to force a column comparison to be case sensitive even
if the column isn't defined as @code{BINARY} or @code{BLOB}:
@example
mysql> select "a" = "A";
mysql> SELECT "a" = "A";
-> 1
mysql> select BINARY "a" = "A";
mysql> SELECT BINARY "a" = "A";
-> 0
@end example
......@@ -31224,7 +31224,7 @@ is also an integer, the result will be an unsigned integer.
@item +
Addition:
@example
mysql> select 3+5;
mysql> SELECT 3+5;
-> 8
@end example
......@@ -31233,7 +31233,7 @@ mysql> select 3+5;
@item -
Subtraction:
@example
mysql> select 3-5;
mysql> SELECT 3-5;
-> -2
@end example
......@@ -31242,11 +31242,11 @@ mysql> select 3-5;
@item *
Multiplication:
@example
mysql> select 3*5;
mysql> SELECT 3*5;
-> 15
mysql> select 18014398509481984*18014398509481984.0;
mysql> SELECT 18014398509481984*18014398509481984.0;
-> 324518553658426726783156020576256.0
mysql> select 18014398509481984*18014398509481984;
mysql> SELECT 18014398509481984*18014398509481984;
-> 0
@end example
......@@ -31259,14 +31259,14 @@ calculations.
@item /
Division:
@example
mysql> select 3/5;
mysql> SELECT 3/5;
-> 0.60
@end example
Division by zero produces a @code{NULL} result:
@example
mysql> select 102/(1-1);
mysql> SELECT 102/(1-1);
-> NULL
@end example
......@@ -31289,7 +31289,7 @@ All mathematical functions return @code{NULL} in case of an error.
@item -
Unary minus. Changes the sign of the argument:
@example
mysql> select - 2;
mysql> SELECT - 2;
-> -2
@end example
......@@ -31301,9 +31301,9 @@ may have the value of @code{-2^63}!
@item ABS(X)
Returns the absolute value of @code{X}:
@example
mysql> select ABS(2);
mysql> SELECT ABS(2);
-> 2
mysql> select ABS(-32);
mysql> SELECT ABS(-32);
-> 32
@end example
......@@ -31314,11 +31314,11 @@ This function is safe to use with @code{BIGINT} values.
Returns the sign of the argument as @code{-1}, @code{0}, or @code{1}, depending
on whether @code{X} is negative, zero, or positive:
@example
mysql> select SIGN(-32);
mysql> SELECT SIGN(-32);
-> -1
mysql> select SIGN(0);
mysql> SELECT SIGN(0);
-> 0
mysql> select SIGN(234);
mysql> SELECT SIGN(234);
-> 1
@end example
......@@ -31330,11 +31330,11 @@ mysql> select SIGN(234);
Modulo (like the @code{%} operator in C).
Returns the remainder of @code{N} divided by @code{M}:
@example
mysql> select MOD(234, 10);
mysql> SELECT MOD(234, 10);
-> 4
mysql> select 253 % 7;
mysql> SELECT 253 % 7;
-> 1
mysql> select MOD(29,9);
mysql> SELECT MOD(29,9);
-> 2
@end example
......@@ -31344,9 +31344,9 @@ This function is safe to use with @code{BIGINT} values.
@item FLOOR(X)
Returns the largest integer value not greater than @code{X}:
@example
mysql> select FLOOR(1.23);
mysql> SELECT FLOOR(1.23);
-> 1
mysql> select FLOOR(-1.23);
mysql> SELECT FLOOR(-1.23);
-> -2
@end example
......@@ -31356,9 +31356,9 @@ Note that the return value is converted to a @code{BIGINT}!
@item CEILING(X)
Returns the smallest integer value not less than @code{X}:
@example
mysql> select CEILING(1.23);
mysql> SELECT CEILING(1.23);
-> 2
mysql> select CEILING(-1.23);
mysql> SELECT CEILING(-1.23);
-> -1
@end example
......@@ -31368,11 +31368,11 @@ Note that the return value is converted to a @code{BIGINT}!
@item ROUND(X)
Returns the argument @code{X}, rounded to the nearest integer:
@example
mysql> select ROUND(-1.23);
mysql> SELECT ROUND(-1.23);
-> -1
mysql> select ROUND(-1.58);
mysql> SELECT ROUND(-1.58);
-> -2
mysql> select ROUND(1.58);
mysql> SELECT ROUND(1.58);
-> 2
@end example
......@@ -31390,9 +31390,9 @@ If @code{D} is @code{0}, the result will have no decimal point or fractional
part:
@example
mysql> select ROUND(1.298, 1);
mysql> SELECT ROUND(1.298, 1);
-> 1.3
mysql> select ROUND(1.298, 0);
mysql> SELECT ROUND(1.298, 0);
-> 1
@end example
......@@ -31401,18 +31401,18 @@ mysql> select ROUND(1.298, 0);
Returns the value of @code{e} (the base of natural logarithms) raised to
the power of @code{X}:
@example
mysql> select EXP(2);
mysql> SELECT EXP(2);
-> 7.389056
mysql> select EXP(-2);
mysql> SELECT EXP(-2);
-> 0.135335
@end example
@findex LOG()
@item LOG(X)
Returns the natural logarithm of @code{X}:
@example
mysql> select LOG(2);
mysql> SELECT LOG(2);
-> 0.693147
mysql> select LOG(-2);
mysql> SELECT LOG(-2);
-> NULL
@end example
If you want the log of a number @code{X} to some arbitary base @code{B}, use
......@@ -31422,11 +31422,11 @@ the formula @code{LOG(X)/LOG(B)}.
@item LOG10(X)
Returns the base-10 logarithm of @code{X}:
@example
mysql> select LOG10(2);
mysql> SELECT LOG10(2);
-> 0.301030
mysql> select LOG10(100);
mysql> SELECT LOG10(100);
-> 2.000000
mysql> select LOG10(-100);
mysql> SELECT LOG10(-100);
-> NULL
@end example
......@@ -31436,9 +31436,9 @@ mysql> select LOG10(-100);
@itemx POWER(X,Y)
Returns the value of @code{X} raised to the power of @code{Y}:
@example
mysql> select POW(2,2);
mysql> SELECT POW(2,2);
-> 4.000000
mysql> select POW(2,-2);
mysql> SELECT POW(2,-2);
-> 0.250000
@end example
......@@ -31446,9 +31446,9 @@ mysql> select POW(2,-2);
@item SQRT(X)
Returns the non-negative square root of @code{X}:
@example
mysql> select SQRT(4);
mysql> SELECT SQRT(4);
-> 2.000000
mysql> select SQRT(20);
mysql> SELECT SQRT(20);
-> 4.472136
@end example
......@@ -31457,7 +31457,7 @@ mysql> select SQRT(20);
Returns the value of PI. The default shown number of decimals is 5, but
MySQL internally uses the full double precession for PI.
@example
mysql> select PI();
mysql> SELECT PI();
-> 3.141593
mysql> SELECT PI()+0.000000000000000000;
-> 3.141592653589793116
......@@ -31467,7 +31467,7 @@ mysql> SELECT PI()+0.000000000000000000;
@item COS(X)
Returns the cosine of @code{X}, where @code{X} is given in radians:
@example
mysql> select COS(PI());
mysql> SELECT COS(PI());
-> -1.000000
@end example
......@@ -31475,7 +31475,7 @@ mysql> select COS(PI());
@item SIN(X)
Returns the sine of @code{X}, where @code{X} is given in radians:
@example
mysql> select SIN(PI());
mysql> SELECT SIN(PI());
-> 0.000000
@end example
......@@ -31483,7 +31483,7 @@ mysql> select SIN(PI());
@item TAN(X)
Returns the tangent of @code{X}, where @code{X} is given in radians:
@example
mysql> select TAN(PI()+1);
mysql> SELECT TAN(PI()+1);
-> 1.557408
@end example
......@@ -31493,11 +31493,11 @@ Returns the arc cosine of @code{X}, that is, the value whose cosine is
@code{X}. Returns @code{NULL} if @code{X} is not in the range @code{-1} to
@code{1}:
@example
mysql> select ACOS(1);
mysql> SELECT ACOS(1);
-> 0.000000
mysql> select ACOS(1.0001);
mysql> SELECT ACOS(1.0001);
-> NULL
mysql> select ACOS(0);
mysql> SELECT ACOS(0);
-> 1.570796
@end example
......@@ -31507,9 +31507,9 @@ Returns the arc sine of @code{X}, that is, the value whose sine is
@code{X}. Returns @code{NULL} if @code{X} is not in the range @code{-1} to
@code{1}:
@example
mysql> select ASIN(0.2);
mysql> SELECT ASIN(0.2);
-> 0.201358
mysql> select ASIN('foo');
mysql> SELECT ASIN('foo');
-> 0.000000
@end example
......@@ -31518,9 +31518,9 @@ mysql> select ASIN('foo');
Returns the arc tangent of @code{X}, that is, the value whose tangent is
@code{X}:
@example
mysql> select ATAN(2);
mysql> SELECT ATAN(2);
-> 1.107149
mysql> select ATAN(-2);
mysql> SELECT ATAN(-2);
-> -1.107149
@end example
......@@ -31532,9 +31532,9 @@ similar to calculating the arc tangent of @code{Y / X}, except that the
signs of both arguments are used to determine the quadrant of the
result:
@example
mysql> select ATAN(-2,2);
mysql> SELECT ATAN(-2,2);
-> -0.785398
mysql> select ATAN2(PI(),0);
mysql> SELECT ATAN2(PI(),0);
-> 1.570796
@end example
......@@ -31542,9 +31542,9 @@ mysql> select ATAN2(PI(),0);
@item COT(X)
Returns the cotangent of @code{X}:
@example
mysql> select COT(12);
mysql> SELECT COT(12);
-> -1.57267341
mysql> select COT(0);
mysql> SELECT COT(0);
-> NULL
@end example
......@@ -31554,15 +31554,15 @@ mysql> select COT(0);
Returns a random floating-point value in the range @code{0} to @code{1.0}.
If an integer argument @code{N} is specified, it is used as the seed value:
@example
mysql> select RAND();
mysql> SELECT RAND();
-> 0.9233482386203
mysql> select RAND(20);
mysql> SELECT RAND(20);
-> 0.15888261251047
mysql> select RAND(20);
mysql> SELECT RAND(20);
-> 0.15888261251047
mysql> select RAND();
mysql> SELECT RAND();
-> 0.63553050033332
mysql> select RAND();
mysql> SELECT RAND();
-> 0.70100469486881
@end example
......@@ -31604,11 +31604,11 @@ In other cases, the arguments are compared as case-insensitive strings:
@end itemize
@example
mysql> select LEAST(2,0);
mysql> SELECT LEAST(2,0);
-> 0
mysql> select LEAST(34.0,3.0,5.0,767.0);
mysql> SELECT LEAST(34.0,3.0,5.0,767.0);
-> 3.0
mysql> select LEAST("B","A","C");
mysql> SELECT LEAST("B","A","C");
-> "A"
@end example
In MySQL versions prior to Version 3.22.5, you can use @code{MIN()}
......@@ -31619,11 +31619,11 @@ instead of @code{LEAST}.
Returns the largest (maximum-valued) argument.
The arguments are compared using the same rules as for @code{LEAST}:
@example
mysql> select GREATEST(2,0);
mysql> SELECT GREATEST(2,0);
-> 2
mysql> select GREATEST(34.0,3.0,5.0,767.0);
mysql> SELECT GREATEST(34.0,3.0,5.0,767.0);
-> 767.0
mysql> select GREATEST("B","A","C");
mysql> SELECT GREATEST("B","A","C");
-> "C"
@end example
In MySQL versions prior to Version 3.22.5, you can use @code{MAX()}
......@@ -31633,7 +31633,7 @@ instead of @code{GREATEST}.
@item DEGREES(X)
Returns the argument @code{X}, converted from radians to degrees:
@example
mysql> select DEGREES(PI());
mysql> SELECT DEGREES(PI());
-> 180.000000
@end example
......@@ -31641,7 +31641,7 @@ mysql> select DEGREES(PI());
@item RADIANS(X)
Returns the argument @code{X}, converted from degrees to radians:
@example
mysql> select RADIANS(90);
mysql> SELECT RADIANS(90);
-> 1.570796
@end example
......@@ -31650,11 +31650,11 @@ mysql> select RADIANS(90);
Returns the number @code{X}, truncated to @code{D} decimals. If @code{D}
is @code{0}, the result will have no decimal point or fractional part:
@example
mysql> select TRUNCATE(1.223,1);
mysql> SELECT TRUNCATE(1.223,1);
-> 1.2
mysql> select TRUNCATE(1.999,1);
mysql> SELECT TRUNCATE(1.999,1);
-> 1.9
mysql> select TRUNCATE(1.999,0);
mysql> SELECT TRUNCATE(1.999,0);
-> 1
@end example
......@@ -31664,7 +31664,7 @@ result:
@cindex rounding errors
@example
mysql> select TRUNCATE(10.28*100,0);
mysql> SELECT TRUNCATE(10.28*100,0);
-> 1027
@end example
......@@ -31686,7 +31686,7 @@ Here is an example that uses date functions. The query below selects
all records with a @code{date_col} value from within the last 30 days:
@example
mysql> SELECT something FROM table
mysql> SELECT something FROM tbl_name
WHERE TO_DAYS(NOW()) - TO_DAYS(date_col) <= 30;
@end example
......@@ -31699,7 +31699,7 @@ for @code{date} (@code{1} = Sunday, @code{2} = Monday, ... @code{7} =
Saturday). These index values correspond to the ODBC standard:
@example
mysql> select DAYOFWEEK('1998-02-03');
mysql> SELECT DAYOFWEEK('1998-02-03');
-> 3
@end example
......@@ -31709,9 +31709,9 @@ Returns the weekday index for
@code{date} (@code{0} = Monday, @code{1} = Tuesday, ... @code{6} = Sunday):
@example
mysql> select WEEKDAY('1997-10-04 22:23:00');
mysql> SELECT WEEKDAY('1997-10-04 22:23:00');
-> 5
mysql> select WEEKDAY('1997-11-05');
mysql> SELECT WEEKDAY('1997-11-05');
-> 2
@end example
......@@ -31721,7 +31721,7 @@ Returns the day of the month for @code{date}, in the range @code{1} to
@code{31}:
@example
mysql> select DAYOFMONTH('1998-02-03');
mysql> SELECT DAYOFMONTH('1998-02-03');
-> 3
@end example
......@@ -31731,7 +31731,7 @@ Returns the day of the year for @code{date}, in the range @code{1} to
@code{366}:
@example
mysql> select DAYOFYEAR('1998-02-03');
mysql> SELECT DAYOFYEAR('1998-02-03');
-> 34
@end example
......@@ -31740,7 +31740,7 @@ mysql> select DAYOFYEAR('1998-02-03');
Returns the month for @code{date}, in the range @code{1} to @code{12}:
@example
mysql> select MONTH('1998-02-03');
mysql> SELECT MONTH('1998-02-03');
-> 2
@end example
......@@ -31749,7 +31749,7 @@ mysql> select MONTH('1998-02-03');
Returns the name of the weekday for @code{date}:
@example
mysql> select DAYNAME("1998-02-05");
mysql> SELECT DAYNAME("1998-02-05");
-> 'Thursday'
@end example
......@@ -31758,7 +31758,7 @@ mysql> select DAYNAME("1998-02-05");
Returns the name of the month for @code{date}:
@example
mysql> select MONTHNAME("1998-02-05");
mysql> SELECT MONTHNAME("1998-02-05");
-> 'February'
@end example
......@@ -31768,7 +31768,7 @@ Returns the quarter of the year for @code{date}, in the range @code{1}
to @code{4}:
@example
mysql> select QUARTER('98-04-01');
mysql> SELECT QUARTER('98-04-01');
-> 2
@end example
......@@ -31784,13 +31784,13 @@ second argument is @code{0}, on Monday if the second argument is
@code{1}:
@example
mysql> select WEEK('1998-02-20');
mysql> SELECT WEEK('1998-02-20');
-> 7
mysql> select WEEK('1998-02-20',0);
mysql> SELECT WEEK('1998-02-20',0);
-> 7
mysql> select WEEK('1998-02-20',1);
mysql> SELECT WEEK('1998-02-20',1);
-> 8
mysql> select WEEK('1998-12-31',1);
mysql> SELECT WEEK('1998-12-31',1);
-> 53
@end example
......@@ -31802,7 +31802,7 @@ calendar in the USA.
Returns the year for @code{date}, in the range @code{1000} to @code{9999}:
@example
mysql> select YEAR('98-02-03');
mysql> SELECT YEAR('98-02-03');
-> 1998
@end example
......@@ -31814,7 +31814,7 @@ different from the year in the date argument for the first and the last
week of the year:
@example
mysql> select YEARWEEK('1987-01-01');
mysql> SELECT YEARWEEK('1987-01-01');
-> 198653
@end example
......@@ -31823,7 +31823,7 @@ mysql> select YEARWEEK('1987-01-01');
Returns the hour for @code{time}, in the range @code{0} to @code{23}:
@example
mysql> select HOUR('10:05:03');
mysql> SELECT HOUR('10:05:03');
-> 10
@end example
......@@ -31832,7 +31832,7 @@ mysql> select HOUR('10:05:03');
Returns the minute for @code{time}, in the range @code{0} to @code{59}:
@example
mysql> select MINUTE('98-02-03 10:05:03');
mysql> SELECT MINUTE('98-02-03 10:05:03');
-> 5
@end example
......@@ -31841,7 +31841,7 @@ mysql> select MINUTE('98-02-03 10:05:03');
Returns the second for @code{time}, in the range @code{0} to @code{59}:
@example
mysql> select SECOND('10:05:03');
mysql> SELECT SECOND('10:05:03');
-> 3
@end example
......@@ -31853,7 +31853,7 @@ Adds @code{N} months to period @code{P} (in the format @code{YYMM} or
Note that the period argument @code{P} is @emph{not} a date value:
@example
mysql> select PERIOD_ADD(9801,2);
mysql> SELECT PERIOD_ADD(9801,2);
-> 199803
@end example
......@@ -31866,7 +31866,7 @@ Note that the period arguments @code{P1} and @code{P2} are @emph{not}
date values:
@example
mysql> select PERIOD_DIFF(9802,199703);
mysql> SELECT PERIOD_DIFF(9802,199703);
-> 11
@end example
......@@ -31967,9 +31967,9 @@ contains a time part, the date value will be automatically converted to a
datetime value:
@example
mysql> select date_add("1999-01-01", interval 1 day);
mysql> SELECT DATE_ADD("1999-01-01", INTERVAL 1 DAY);
-> 1999-01-02
mysql> select date_add("1999-01-01", interval 1 hour);
mysql> SELECT DATE_ADD("1999-01-01", INTERVAL 1 HOUR);
-> 1999-01-01 01:00:00
@end example
......@@ -31979,7 +31979,7 @@ has a day that is larger than the maximum day for the new month, the day is
adjusted to the maximum days in the new month:
@example
mysql> select DATE_ADD('1998-01-30', Interval 1 month);
mysql> SELECT DATE_ADD('1998-01-30', INTERVAL 1 MONTH);
-> 1998-02-28
@end example
......@@ -32008,9 +32008,9 @@ Given a date @code{date}, returns a daynumber (the number of days since year
0):
@example
mysql> select TO_DAYS(950501);
mysql> SELECT TO_DAYS(950501);
-> 728779
mysql> select TO_DAYS('1997-10-07');
mysql> SELECT TO_DAYS('1997-10-07');
-> 729669
@end example
......@@ -32023,7 +32023,7 @@ days that were lost when the calendar was changed.
Given a daynumber @code{N}, returns a @code{DATE} value:
@example
mysql> select FROM_DAYS(729669);
mysql> SELECT FROM_DAYS(729669);
-> '1997-10-07'
@end example
......@@ -32073,17 +32073,17 @@ following specifiers may be used in the @code{format} string:
All other characters are just copied to the result without interpretation:
@example
mysql> select DATE_FORMAT('1997-10-04 22:23:00', '%W %M %Y');
mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', '%W %M %Y');
-> 'Saturday October 1997'
mysql> select DATE_FORMAT('1997-10-04 22:23:00', '%H:%i:%s');
mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00', '%H:%i:%s');
-> '22:23:00'
mysql> select DATE_FORMAT('1997-10-04 22:23:00',
mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00',
'%D %y %a %d %m %b %j');
-> '4th 97 Sat 04 10 Oct 277'
mysql> select DATE_FORMAT('1997-10-04 22:23:00',
mysql> SELECT DATE_FORMAT('1997-10-04 22:23:00',
'%H %k %I %r %T %S %w');
-> '22 22 10 10:23:00 PM 22:23:00 00 6'
mysql> select DATE_FORMAT('1999-01-01', '%X %V');
mysql> SELECT DATE_FORMAT('1999-01-01', '%X %V');
-> '1998 52'
@end example
......@@ -32107,9 +32107,9 @@ format, depending on whether the function is used in a string or numeric
context:
@example
mysql> select CURDATE();
mysql> SELECT CURDATE();
-> '1997-12-15'
mysql> select CURDATE() + 0;
mysql> SELECT CURDATE() + 0;
-> 19971215
@end example
......@@ -32122,9 +32122,9 @@ format, depending on whether the function is used in a string or numeric
context:
@example
mysql> select CURTIME();
mysql> SELECT CURTIME();
-> '23:50:26'
mysql> select CURTIME() + 0;
mysql> SELECT CURTIME() + 0;
-> 235026
@end example
......@@ -32139,9 +32139,9 @@ or @code{YYYYMMDDHHMMSS} format, depending on whether the function is used in
a string or numeric context:
@example
mysql> select NOW();
mysql> SELECT NOW();
-> '1997-12-15 23:50:26'
mysql> select NOW() + 0;
mysql> SELECT NOW() + 0;
-> 19971215235026
@end example
......@@ -32157,9 +32157,9 @@ returns the value of the argument as seconds since @code{'1970-01-01
@code{YYMMDD} or @code{YYYYMMDD} in local time:
@example
mysql> select UNIX_TIMESTAMP();
mysql> SELECT UNIX_TIMESTAMP();
-> 882226357
mysql> select UNIX_TIMESTAMP('1997-10-04 22:23:00');
mysql> SELECT UNIX_TIMESTAMP('1997-10-04 22:23:00');
-> 875996580
@end example
......@@ -32179,9 +32179,9 @@ Returns a representation of the @code{unix_timestamp} argument as a value in
whether the function is used in a string or numeric context:
@example
mysql> select FROM_UNIXTIME(875996580);
mysql> SELECT FROM_UNIXTIME(875996580);
-> '1997-10-04 22:23:00'
mysql> select FROM_UNIXTIME(875996580) + 0;
mysql> SELECT FROM_UNIXTIME(875996580) + 0;
-> 19971004222300
@end example
......@@ -32192,7 +32192,7 @@ the @code{format} string. @code{format} may contain the same specifiers as
those listed in the entry for the @code{DATE_FORMAT()} function:
@example
mysql> select FROM_UNIXTIME(UNIX_TIMESTAMP(),
mysql> SELECT FROM_UNIXTIME(UNIX_TIMESTAMP(),
'%Y %D %M %h:%i:%s %x');
-> '1997 23rd December 03:43:30 1997'
@end example
......@@ -32204,9 +32204,9 @@ as a value in @code{'HH:MM:SS'} or @code{HHMMSS} format, depending on whether
the function is used in a string or numeric context:
@example
mysql> select SEC_TO_TIME(2378);
mysql> SELECT SEC_TO_TIME(2378);
-> '00:39:38'
mysql> select SEC_TO_TIME(2378) + 0;
mysql> SELECT SEC_TO_TIME(2378) + 0;
-> 3938
@end example
......@@ -32215,9 +32215,9 @@ mysql> select SEC_TO_TIME(2378) + 0;
Returns the @code{time} argument, converted to seconds:
@example
mysql> select TIME_TO_SEC('22:23:00');
mysql> SELECT TIME_TO_SEC('22:23:00');
-> 80580
mysql> select TIME_TO_SEC('00:39:38');
mysql> SELECT TIME_TO_SEC('00:39:38');
-> 2378
@end example
@end table
......@@ -32269,7 +32269,7 @@ To cast a string to a numeric value, you don't normally have to do
anything; Just use the string value as it would be a number:
@example
mysql> select 1+'1';
mysql> SELECT 1+'1';
-> 2
@end example
......@@ -32281,9 +32281,9 @@ cast operators, which will cast the operation to signed respective
unsigned 64 bit integer.
@example
mysql> select CAST(1-2 AS UNSIGNED)
mysql> SELECT CAST(1-2 AS UNSIGNED)
-> 18446744073709551615
mysql select CAST(CAST(1-2 AS UNSIGNED) AS SIGNED);
mysql> SELECT CAST(CAST(1-2 AS UNSIGNED) AS SIGNED);
-> -1
@end example
......@@ -32292,7 +32292,7 @@ Note that if either operation is a floating point value (In this context
be a floating point value and is not affected by the above rule.
@example
mysql> select CAST(1 AS UNSIGNED) -2.0
mysql> SELECT CAST(1 AS UNSIGNED) -2.0
-> -1.0
@end example
......@@ -32346,7 +32346,7 @@ these operators have a maximum range of 64 bits.
@item |
Bitwise OR
@example
mysql> select 29 | 15;
mysql> SELECT 29 | 15;
-> 31
@end example
......@@ -32357,7 +32357,7 @@ The result is an unsigned 64 bit integer.
@item &
Bitwise AND:
@example
mysql> select 29 & 15;
mysql> SELECT 29 & 15;
-> 13
@end example
......@@ -32367,7 +32367,7 @@ The result is an unsigned 64 bit integer.
@item <<
Shifts a longlong (@code{BIGINT}) number to the left:
@example
mysql> select 1 << 2;
mysql> SELECT 1 << 2;
-> 4
@end example
......@@ -32377,7 +32377,7 @@ The result is an unsigned 64 bit integer.
@item >>
Shifts a longlong (@code{BIGINT}) number to the right:
@example
mysql> select 4 >> 2;
mysql> SELECT 4 >> 2;
-> 1
@end example
......@@ -32387,7 +32387,7 @@ The result is an unsigned 64 bit integer.
@item ~
Invert all bits:
@example
mysql> select 5 & ~1;
mysql> SELECT 5 & ~1;
-> 4
@end example
......@@ -32397,7 +32397,7 @@ The result is an unsigned 64 bit integer.
@item BIT_COUNT(N)
Returns the number of bits that are set in the argument @code{N}:
@example
mysql> select BIT_COUNT(29);
mysql> SELECT BIT_COUNT(29);
-> 4
@end example
@end table
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