func_group.result 45.9 KB
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drop table if exists t1,t2;
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set @sav_dpi= @@div_precision_increment;
set div_precision_increment= 5;
show variables like 'div_precision_increment';
Variable_name	Value
div_precision_increment	5
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create table t1 (grp int, a bigint unsigned, c char(10) not null);
insert into t1 values (1,1,"a");
insert into t1 values (2,2,"b");
insert into t1 values (2,3,"c");
insert into t1 values (3,4,"E");
insert into t1 values (3,5,"C");
insert into t1 values (3,6,"D");
select a,c,sum(a) from t1 group by a;
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a	c	sum(a)
1	a	1
2	b	2
3	c	3
4	E	4
5	C	5
6	D	6
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select a,c,sum(a) from t1 where a > 10 group by a;
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a	c	sum(a)
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select sum(a) from t1 where a > 10;
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sum(a)
NULL
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select a from t1 order by rand(10);
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a
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2
6
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1
3
5
4
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select distinct a from t1 order by rand(10);
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a
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2
6
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1
3
5
4
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select count(distinct a),count(distinct grp) from t1;
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count(distinct a)	count(distinct grp)
6	3
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insert into t1 values (null,null,'');
select count(distinct a),count(distinct grp) from t1;
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count(distinct a)	count(distinct grp)
6	3
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select sum(all a),count(all a),avg(all a),std(all a),variance(all a),bit_or(all a),bit_and(all a),min(all a),max(all a),min(all c),max(all c) from t1;
sum(all a)	count(all a)	avg(all a)	std(all a)	variance(all a)	bit_or(all a)	bit_and(all a)	min(all a)	max(all a)	min(all c)	max(all c)
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21	6	3.50000	1.70783	2.91667	7	0	1	6		E
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select grp, sum(a),count(a),avg(a),std(a),variance(a),bit_or(a),bit_and(a),min(a),max(a),min(c),max(c) from t1 group by grp;
grp	sum(a)	count(a)	avg(a)	std(a)	variance(a)	bit_or(a)	bit_and(a)	min(a)	max(a)	min(c)	max(c)
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NULL	NULL	0	NULL	NULL	NULL	0	18446744073709551615	NULL	NULL		
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1	1	1	1.00000	0.00000	0.00000	1	1	1	1	a	a
2	5	2	2.50000	0.50000	0.25000	3	2	2	3	b	c
3	15	3	5.00000	0.81650	0.66667	7	4	4	6	C	E
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select grp, sum(a)+count(a)+avg(a)+std(a)+variance(a)+bit_or(a)+bit_and(a)+min(a)+max(a)+min(c)+max(c) as sum from t1 group by grp;
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grp	sum
NULL	NULL
1	7
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2	20.25
3	45.483163247594
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create table t2 (grp int, a bigint unsigned, c char(10));
insert into t2 select grp,max(a)+max(grp),max(c) from t1 group by grp;
replace into t2 select grp, a, c from t1 limit 2,1;
select * from t2;
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grp	a	c
NULL	NULL	
1	2	a
2	5	c
3	9	E
2	3	c
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drop table t1,t2;
CREATE TABLE t1 (id int(11),value1 float(10,2));
INSERT INTO t1 VALUES (1,0.00),(1,1.00), (1,2.00), (2,10.00), (2,11.00), (2,12.00);
CREATE TABLE t2 (id int(11),name char(20));
INSERT INTO t2 VALUES (1,'Set One'),(2,'Set Two');
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select id, avg(value1), std(value1), variance(value1) from t1 group by id;
id	avg(value1)	std(value1)	variance(value1)
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1	1.0000000	0.816497	0.666667
2	11.0000000	0.816497	0.666667
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select name, avg(value1), std(value1), variance(value1) from t1, t2 where t1.id = t2.id group by t1.id;
name	avg(value1)	std(value1)	variance(value1)
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Set One	1.0000000	0.816497	0.666667
Set Two	11.0000000	0.816497	0.666667
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drop table t1,t2;
create table t1 (id int not null);
create table t2 (id int not null,rating int null);
insert into t1 values(1),(2),(3);
insert into t2 values(1, 3),(2, NULL),(2, NULL),(3, 2),(3, NULL);
select t1.id, avg(rating) from t1 left join t2 on ( t1.id = t2.id ) group by t1.id;
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id	avg(rating)
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1	3.00000
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2	NULL
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3	2.00000
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select sql_small_result t2.id, avg(rating) from t2 group by t2.id;
id	avg(rating)
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1	3.00000
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2	NULL
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3	2.00000
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select sql_big_result t2.id, avg(rating) from t2 group by t2.id;
id	avg(rating)
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1	3.00000
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2	NULL
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3	2.00000
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select sql_small_result t2.id, avg(rating+0.0e0) from t2 group by t2.id;
id	avg(rating+0.0e0)
1	3
2	NULL
3	2
select sql_big_result t2.id, avg(rating+0.0e0) from t2 group by t2.id;
id	avg(rating+0.0e0)
1	3
2	NULL
3	2
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drop table t1,t2;
create table t1 (a smallint(6) primary key, c char(10), b text);
INSERT INTO t1 VALUES (1,'1','1');
INSERT INTO t1 VALUES (2,'2','2');
INSERT INTO t1 VALUES (4,'4','4');
select count(*) from t1;
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count(*)
3
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select count(*) from t1 where a = 1;
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count(*)
1
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select count(*) from t1 where a = 100;
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count(*)
0
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select count(*) from t1 where a >= 10;
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count(*)
0
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select count(a) from t1 where a = 1;
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count(a)
1
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select count(a) from t1 where a = 100;
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count(a)
0
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select count(a) from t1 where a >= 10;
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count(a)
0
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select count(b) from t1 where b >= 2;
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count(b)
2
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select count(b) from t1 where b >= 10;
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count(b)
0
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select count(c) from t1 where c = 10;
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count(c)
0
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drop table t1;
CREATE TABLE t1 (d DATETIME, i INT);
INSERT INTO t1 VALUES (NOW(), 1);
SELECT COUNT(i), i, COUNT(i)*i FROM t1 GROUP BY i;
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COUNT(i)	i	COUNT(i)*i
1	1	1
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SELECT COUNT(i), (i+0), COUNT(i)*(i+0) FROM t1 GROUP BY i;
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COUNT(i)	(i+0)	COUNT(i)*(i+0)
1	1	1
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DROP TABLE t1;
create table t1 (
num float(5,2),
user char(20)
);
insert into t1 values (10.3,'nem'),(20.53,'monty'),(30.23,'sinisa');
insert into t1 values (30.13,'nem'),(20.98,'monty'),(10.45,'sinisa');
insert into t1 values (5.2,'nem'),(8.64,'monty'),(11.12,'sinisa');
select sum(num) from t1;
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sum(num)
147.58
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select sum(num) from t1 group by user;
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sum(num)
50.15
45.63
51.80
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drop table t1;
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create table t1 (a1 int, a2 char(3), key k1(a1), key k2(a2));
insert into t1 values(10,'aaa'), (10,null), (10,'bbb'), (20,'zzz');
create table t2(a1 char(3), a2 int, a3 real, key k1(a1), key k2(a2, a1));
select * from t1;
a1	a2
10	aaa
10	NULL
10	bbb
20	zzz
select min(a2) from t1;
min(a2)
aaa
select max(t1.a1), max(t2.a2) from t1, t2;
max(t1.a1)	max(t2.a2)
NULL	NULL
select max(t1.a1) from t1, t2;
max(t1.a1)
NULL
select max(t2.a2), max(t1.a1) from t1, t2;
max(t2.a2)	max(t1.a1)
NULL	NULL
explain select min(a2) from t1;
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id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
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explain select max(t1.a1), max(t2.a2) from t1, t2;
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id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching min/max row
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insert into t2 values('AAA', 10, 0.5);
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insert into t2 values('BBB', 20, 1.0);
select t1.a1, t1.a2, t2.a1, t2.a2 from t1,t2;
a1	a2	a1	a2
10	aaa	AAA	10
10	aaa	BBB	20
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10	NULL	AAA	10
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10	NULL	BBB	20
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10	bbb	AAA	10
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10	bbb	BBB	20
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20	zzz	AAA	10
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20	zzz	BBB	20
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select max(t1.a1), max(t2.a1) from t1, t2 where t2.a2=9;
max(t1.a1)	max(t2.a1)
NULL	NULL
select max(t2.a1), max(t1.a1) from t1, t2 where t2.a2=9;
max(t2.a1)	max(t1.a1)
NULL	NULL
select t1.a1, t1.a2, t2.a1, t2.a2 from t1 left outer join t2 on t1.a1=10;
a1	a2	a1	a2
10	aaa	AAA	10
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10	aaa	BBB	20
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10	NULL	AAA	10
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10	NULL	BBB	20
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10	bbb	AAA	10
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10	bbb	BBB	20
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20	zzz	NULL	NULL
select max(t1.a2) from t1 left outer join t2 on t1.a1=10;
max(t1.a2)
zzz
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select max(t2.a1) from t2 left outer join t1 on t2.a2=10 where t2.a2=20;
max(t2.a1)
BBB
select max(t2.a1) from t2 left outer join t1 on t2.a2=10 where t2.a2=10;
max(t2.a1)
AAA
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select max(t2.a1) from t1 left outer join t2 on t1.a2=t2.a1 and 1=0 where t2.a1='AAA';
max(t2.a1)
NULL
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select max(t1.a2),max(t2.a1) from t1 left outer join t2 on t1.a1=10;
max(t1.a2)	max(t2.a1)
zzz	BBB
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drop table t1,t2;
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CREATE TABLE t1 (a int, b int);
select count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1;
count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
insert into t1 values (1,null);
select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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insert into t1 values (1,null);
insert into t1 values (2,null);
select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
2	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
2	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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insert into t1 values (2,1);
select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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2	1	1	1.00000	0.00000	1	1	1	1
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select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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2	1	1	1.00000	0.00000	1	1	1	1
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insert into t1 values (3,1);
select a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)
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1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0
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2	1	1	1.00000	0.00000	1	1	1	1
3	1	1	1.00000	0.00000	1	1	1	1
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select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b), bit_xor(b) from t1 group by a;
a	count(b)	sum(b)	avg(b)	std(b)	min(b)	max(b)	bit_and(b)	bit_or(b)	bit_xor(b)
1	0	NULL	NULL	NULL	NULL	NULL	18446744073709551615	0	0
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2	1	1	1.00000	0.00000	1	1	1	1	1
3	1	1	1.00000	0.00000	1	1	1	1	1
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explain extended select SQL_BIG_RESULT a,count(b), sum(b), avg(b), std(b), min(b), max(b), bit_and(b), bit_or(b), bit_xor(b) from t1 group by a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	Using filesort
Warnings:
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Note	1003	select sql_big_result `test`.`t1`.`a` AS `a`,count(`test`.`t1`.`b`) AS `count(b)`,sum(`test`.`t1`.`b`) AS `sum(b)`,avg(`test`.`t1`.`b`) AS `avg(b)`,std(`test`.`t1`.`b`) AS `std(b)`,min(`test`.`t1`.`b`) AS `min(b)`,max(`test`.`t1`.`b`) AS `max(b)`,bit_and(`test`.`t1`.`b`) AS `bit_and(b)`,bit_or(`test`.`t1`.`b`) AS `bit_or(b)`,bit_xor(`test`.`t1`.`b`) AS `bit_xor(b)` from `test`.`t1` group by `test`.`t1`.`a`
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drop table t1;
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create table t1 (col int);
insert into t1 values (-1), (-2), (-3);
select bit_and(col), bit_or(col) from t1;
bit_and(col)	bit_or(col)
18446744073709551612	18446744073709551615
select SQL_BIG_RESULT bit_and(col), bit_or(col) from t1 group by col;
bit_and(col)	bit_or(col)
18446744073709551613	18446744073709551613
18446744073709551614	18446744073709551614
18446744073709551615	18446744073709551615
drop table t1;
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create table t1 (a int);
select avg(2) from t1;
avg(2)
NULL
drop table t1;
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create table t1(
a1 char(3) primary key,
a2 smallint,
a3 char(3),
a4 real,
a5 date,
key k1(a2,a3),
key k2(a4 desc,a1),
key k3(a5,a1)
);
create table t2(
a1 char(3) primary key,
a2 char(17),
a3 char(2),
a4 char(3),
key k1(a3, a2),
key k2(a4)
);
insert into t1 values('AME',0,'SEA',0.100,date'1942-02-19');
insert into t1 values('HBR',1,'SEA',0.085,date'1948-03-05');
insert into t1 values('BOT',2,'SEA',0.085,date'1951-11-29');
insert into t1 values('BMC',3,'SEA',0.085,date'1958-09-08');
insert into t1 values('TWU',0,'LAX',0.080,date'1969-10-05');
insert into t1 values('BDL',0,'DEN',0.080,date'1960-11-27');
insert into t1 values('DTX',1,'NYC',0.080,date'1961-05-04');
insert into t1 values('PLS',1,'WDC',0.075,date'1949-01-02');
insert into t1 values('ZAJ',2,'CHI',0.075,date'1960-06-15');
insert into t1 values('VVV',2,'MIN',0.075,date'1959-06-28');
insert into t1 values('GTM',3,'DAL',0.070,date'1977-09-23');
insert into t1 values('SSJ',null,'CHI',null,date'1974-03-19');
insert into t1 values('KKK',3,'ATL',null,null);
insert into t1 values('XXX',null,'MIN',null,null);
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insert into t1 values('WWW',1,'LED',null,null);
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insert into t2 values('TKF','Seattle','WA','AME');
insert into t2 values('LCC','Los Angeles','CA','TWU');
insert into t2 values('DEN','Denver','CO','BDL');
insert into t2 values('SDC','San Diego','CA','TWU');
insert into t2 values('NOL','New Orleans','LA','GTM');
insert into t2 values('LAK','Los Angeles','CA','TWU');
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insert into t2 values('AAA','AAA','AA','AME');
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select * from t1;
a1	a2	a3	a4	a5
AME	0	SEA	0.1	1942-02-19
HBR	1	SEA	0.085	1948-03-05
BOT	2	SEA	0.085	1951-11-29
BMC	3	SEA	0.085	1958-09-08
TWU	0	LAX	0.08	1969-10-05
BDL	0	DEN	0.08	1960-11-27
DTX	1	NYC	0.08	1961-05-04
PLS	1	WDC	0.075	1949-01-02
ZAJ	2	CHI	0.075	1960-06-15
VVV	2	MIN	0.075	1959-06-28
GTM	3	DAL	0.07	1977-09-23
SSJ	NULL	CHI	NULL	1974-03-19
KKK	3	ATL	NULL	NULL
XXX	NULL	MIN	NULL	NULL
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WWW	1	LED	NULL	NULL
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select * from t2;
a1	a2	a3	a4
TKF	Seattle	WA	AME
LCC	Los Angeles	CA	TWU
DEN	Denver	CO	BDL
SDC	San Diego	CA	TWU
NOL	New Orleans	LA	GTM
LAK	Los Angeles	CA	TWU
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AAA	AAA	AA	AME
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explain 
select min(a1) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a1) from t1;
min(a1)
AME
explain 
select max(a4) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a4) from t1;
max(a4)
0.1
explain 
select min(a5), max(a5) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a5), max(a5) from t1;
min(a5)	max(a5)
1942-02-19	1977-09-23
explain 
select min(a3) from t1 where a2 = 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a3) from t1 where a2 = 2;
min(a3)
CHI
explain 
select min(a1), max(a1) from t1 where a4 = 0.080;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a1), max(a1) from t1 where a4 = 0.080;
min(a1)	max(a1)
BDL	TWU
explain 
select min(t1.a5), max(t2.a3) from t1, t2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(t1.a5), max(t2.a3) from t1, t2;
min(t1.a5)	max(t2.a3)
1942-02-19	WA
explain 
select min(t1.a3), max(t2.a2) from t1, t2 where t1.a2 = 0 and t2.a3 = 'CA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(t1.a3), max(t2.a2) from t1, t2 where t1.a2 = 0 and t2.a3 = 'CA';
min(t1.a3)	max(t2.a2)
DEN	San Diego
explain 
select min(a1) from t1 where a1 > 'KKK';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a1) from t1 where a1 > 'KKK';
min(a1)
PLS
explain 
select min(a1) from t1 where a1 >= 'KKK';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a1) from t1 where a1 >= 'KKK';
min(a1)
KKK
explain 
select max(a3) from t1 where a2 = 2 and a3 < 'SEA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a3) from t1 where a2 = 2 and a3 < 'SEA';
max(a3)
MIN
explain 
select max(a5) from t1 where a5 < date'1970-01-01';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a5) from t1 where a5 < date'1970-01-01';
max(a5)
1969-10-05
explain 
select max(a3) from t1 where a2 is null;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a3) from t1 where a2 is null;
max(a3)
MIN
explain 
select max(a3) from t1 where a2 = 0 and a3 between 'K' and 'Q';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a3) from t1 where a2 = 0 and a3 between 'K' and 'Q';
max(a3)
LAX
explain
select min(a1), max(a1) from t1 where a1 between 'A' and 'P';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a1), max(a1) from t1 where a1 between 'A' and 'P';
min(a1)	max(a1)
AME	KKK
explain 
select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a3) from t1 where a3 < 'SEA' and a2 = 2 and a3 <= 'MIN';
max(a3)
MIN
explain 
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select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
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id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
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select max(a3) from t1 where a3 = 'MIN' and a2 = 2;
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max(a3)
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MIN
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explain 
select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching min/max row
select max(a3) from t1 where a3 = 'DEN' and a2 = 2;
max(a3)
NULL
explain
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 = 'CA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 = 'CA';
max(t1.a3)	min(t2.a2)
CHI	Los Angeles
explain
select max(a3) from t1 where a2 is null and a2 = 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
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select max(a3) from t1 where a2 is null and a2 = 2;
max(a3)
NULL
explain
select max(a2) from t1 where a2 >= 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a2) from t1 where a2 >= 1;
max(a2)
3
explain
select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 < 'SEA';
min(a3)
CHI
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explain
select min(a3) from t1 where a2 = 4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching min/max row
select min(a3) from t1 where a2 = 4;
min(a3)
NULL
explain
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching min/max row
select min(a3) from t1 where a2 = 2 and a3 > 'SEA';
min(a3)
NULL
explain
select (min(a4)+max(a4))/2 from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select (min(a4)+max(a4))/2 from t1;
(min(a4)+max(a4))/2
0.085
explain
select min(a3) from t1 where 2 = a2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a3) from t1 where 2 = a2;
min(a3)
CHI
explain
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select max(a3) from t1 where a2 = 2 and 'SEA' > a3;
max(a3)
MIN
explain
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No matching min/max row
select max(a3) from t1 where a2 = 2 and 'SEA' < a3;
max(a3)
NULL
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI';
min(a3)
CHI
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 < 'SEA';
min(a3)
CHI
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(a3) from t1 where a2 = 2 and a3 >= 'CHI' and a3 = 'MIN';
min(a3)
MIN
explain
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
select min(a3) from t1 where a2 = 2 and a3 >= 'SEA' and a3 = 'MIN';
min(a3)
NULL
explain
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
select min(t1.a1), min(t2.a4) from t1,t2 where t1.a1 < 'KKK' and t2.a4 < 'KKK';
min(t1.a1)	min(t2.a4)
AME	AME
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explain 
select min(a1) from t1 where a1 > 'KKK' or a1 < 'XXX';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
604
1	SIMPLE	t1	index	PRIMARY	PRIMARY	3	NULL	15	Using where; Using index
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explain 
select min(a1) from t1 where a1 != 'KKK';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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1	SIMPLE	t1	index	PRIMARY	PRIMARY	3	NULL	15	Using where; Using index
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explain
select max(a3) from t1 where a2 < 2 and a3 < 'SEA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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1	SIMPLE	t1	range	k1	k1	3	NULL	6	Using where; Using index
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explain
select max(t1.a3), min(t2.a2) from t1, t2 where t1.a2 = 2 and t1.a3 < 'MIN' and t2.a3 > 'CA';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
616
1	SIMPLE	t1	range	k1	k1	7	NULL	1	Using where; Using index
617
1	SIMPLE	t2	range	k1	k1	3	NULL	4	Using where; Using index
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explain
select min(a4 - 0.01) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
621
1	SIMPLE	t1	index	NULL	k2	12	NULL	15	Using index
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explain
select max(a4 + 0.01) from t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
625
1	SIMPLE	t1	index	NULL	k2	12	NULL	15	Using index
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explain
select min(a3) from t1 where (a2 +1 ) is null;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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1	SIMPLE	t1	index	NULL	k1	7	NULL	15	Using where; Using index
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explain
select min(a3) from t1 where (a2 + 1) = 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
633
1	SIMPLE	t1	index	NULL	k1	7	NULL	15	Using where; Using index
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explain
select min(a3) from t1 where 2 = (a2 + 1);
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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1	SIMPLE	t1	index	NULL	k1	7	NULL	15	Using where; Using index
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explain
select min(a2) from t1 where a2 < 2 * a2 - 8;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
641
1	SIMPLE	t1	index	NULL	k1	7	NULL	15	Using where; Using index
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explain
select min(a1) from t1  where a1 between a3 and 'KKK';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
645
1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	15	Using where
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explain
select min(a4) from t1  where (a4 + 0.01) between 0.07 and 0.08;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
649
1	SIMPLE	t1	index	NULL	k2	12	NULL	15	Using where; Using index
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explain
select concat(min(t1.a1),min(t2.a4)) from t1, t2 where t2.a4 <> 'AME';
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
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653
1	SIMPLE	t2	range	k2	k2	4	NULL	6	Using where; Using index
654
1	SIMPLE	t1	index	NULL	PRIMARY	3	NULL	15	Using index
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655
drop table t1, t2;
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create table t1 (USR_ID integer not null, MAX_REQ integer not null, constraint PK_SEA_USER primary key (USR_ID)) engine=InnoDB;
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insert into t1 values (1, 3);
select count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ from t1 group by MAX_REQ;
count(*) + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ + MAX_REQ - MAX_REQ
1
select Case When Count(*) < MAX_REQ Then 1 Else 0 End from t1 where t1.USR_ID = 1 group by MAX_REQ;
Case When Count(*) < MAX_REQ Then 1 Else 0 End
1
drop table t1;
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create table t1 (a char(10));
insert into t1 values ('a'),('b'),('c');
select coercibility(max(a)) from t1;
coercibility(max(a))
669
2
670
drop table t1;
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create table t1 (a char character set latin2);
insert into t1 values ('a'),('b');
select charset(max(a)), coercibility(max(a)),
charset(min(a)), coercibility(min(a)) from t1;
charset(max(a))	coercibility(max(a))	charset(min(a))	coercibility(min(a))
latin2	2	latin2	2
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show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` char(1) character set latin2 default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
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create table t2 select max(a),min(a) from t1;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
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  `max(a)` char(1) character set latin2 default NULL,
  `min(a)` char(1) character set latin2 default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t2;
create table t2 select concat(a) from t1;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `concat(a)` varchar(1) character set latin2 default NULL
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) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t2,t1;
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create table t1 (a int);
insert into t1 values (1);
select max(a) as b from t1 having b=1;
b
1
select a from t1 having a=1;
a
1
drop table t1;
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create table t1 (a int);
select variance(2) from t1;
variance(2)
NULL
select stddev(2) from t1;
stddev(2)
NULL
drop table t1;
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create table t1 (a int);
insert into t1 values (1),(2);
prepare stmt1 from 'SELECT COUNT(*) FROM t1';
execute stmt1;
COUNT(*)
2
execute stmt1;
COUNT(*)
2
execute stmt1;
COUNT(*)
2
deallocate prepare stmt1;
drop table t1;
create table t1 (a int, primary key(a));
insert into t1 values (1),(2);
prepare stmt1 from 'SELECT max(a) FROM t1';
execute stmt1;
max(a)
2
execute stmt1;
max(a)
2
execute stmt1;
max(a)
2
deallocate prepare stmt1;
drop table t1;
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CREATE TABLE t1 (a int primary key);
INSERT INTO t1 VALUES (1),(2),(3),(4);
SELECT MAX(a) FROM t1 WHERE a > 5;
MAX(a)
NULL
SELECT MIN(a) FROM t1 WHERE a < 0;
MIN(a)
NULL
DROP TABLE t1;
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CREATE TABLE t1 (
id int(10) unsigned NOT NULL auto_increment,
val enum('one','two','three') NOT NULL default 'one',
PRIMARY KEY  (id)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO t1 VALUES
(1,'one'),(2,'two'),(3,'three'),(4,'one'),(5,'two');
select val, count(*) from t1 group by val;
val	count(*)
one	2
two	2
three	1
drop table t1;
CREATE TABLE t1 (
id int(10) unsigned NOT NULL auto_increment,
val set('one','two','three') NOT NULL default 'one',
PRIMARY KEY  (id)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO t1 VALUES
(1,'one'),(2,'two'),(3,'three'),(4,'one'),(5,'two');
select val, count(*) from t1 group by val;
val	count(*)
one	2
two	2
three	1
drop table t1;
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create table t1(a int, b datetime);
insert into t1 values (1, NOW()), (2, NOW());
create table t2 select MAX(b) from t1 group by a;
show create table t2;
Table	Create Table
t2	CREATE TABLE `t2` (
  `MAX(b)` datetime default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1, t2;
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create table t1(f1 datetime);
insert into t1 values (now());
create table t2 select f2 from (select max(now()) f2 from t1) a;
show columns from t2;
Field	Type	Null	Key	Default	Extra
791
f2	datetime	YES		NULL	
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drop table t2;
create table t2 select f2 from (select now() f2 from t1) a;
show columns from t2;
Field	Type	Null	Key	Default	Extra
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f2	datetime	NO		0000-00-00 00:00:00	
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drop table t2, t1;
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CREATE TABLE t1(
id int PRIMARY KEY,
a  int,
b  int,
INDEX i_b_id(a,b,id),
INDEX i_id(a,id)
);
INSERT INTO t1 VALUES 
(1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1);
SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6;
MAX(id)
NULL
DROP TABLE t1;
CREATE TABLE t1(
id int PRIMARY KEY,
a  int,
b  int,
INDEX i_id(a,id),
INDEX i_b_id(a,b,id)
);
INSERT INTO t1 VALUES 
(1,1,4), (2,2,1), (3,1,3), (4,2,1), (5,1,1);
SELECT MAX(id) FROM t1 WHERE id < 3 AND a=2 AND b=6;
MAX(id)
NULL
DROP TABLE t1;
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CREATE TABLE t1 (id int PRIMARY KEY, b char(3), INDEX(b));
INSERT INTO t1 VALUES (1,'xx'), (2,'aa');
SELECT * FROM t1;
id	b
1	xx
2	aa
SELECT MAX(b) FROM t1 WHERE b < 'ppppp';
MAX(b)
aa
SHOW WARNINGS;
Level	Code	Message
SELECT MAX(b) FROM t1 WHERE b < 'pp';
MAX(b)
aa
DROP TABLE t1;
CREATE TABLE t1 (id int PRIMARY KEY, b char(16), INDEX(b(4)));
INSERT INTO t1 VALUES (1, 'xxxxbbbb'), (2, 'xxxxaaaa');
SELECT MAX(b) FROM t1;
MAX(b)
xxxxbbbb
EXPLAIN SELECT MAX(b) FROM t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
DROP TABLE t1;
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CREATE TABLE t1 (id int , b varchar(512), INDEX(b(250))) COLLATE latin1_bin;
INSERT INTO t1 VALUES
(1,CONCAT(REPEAT('_', 250), "qq")), (1,CONCAT(REPEAT('_', 250), "zz")),
(1,CONCAT(REPEAT('_', 250), "aa")), (1,CONCAT(REPEAT('_', 250), "ff"));
SELECT MAX(b) FROM t1;
MAX(b)
__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________zz
EXPLAIN SELECT MAX(b) FROM t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
DROP TABLE t1;
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CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1,1),(1,2),(2,3);
SELECT (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a;
(SELECT COUNT(DISTINCT t1.b))
863
2
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gkodinov/kgeorge@rakia.(none) committed
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1
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SELECT (SELECT COUNT(DISTINCT 12)) FROM t1 GROUP BY t1.a;
(SELECT COUNT(DISTINCT 12))
1
1
SELECT AVG(2), BIT_AND(2), BIT_OR(2), BIT_XOR(2), COUNT(*), COUNT(12),
COUNT(DISTINCT 12), MIN(2),MAX(2),STD(2), VARIANCE(2),SUM(2),
GROUP_CONCAT(2),GROUP_CONCAT(DISTINCT 2);
AVG(2)	BIT_AND(2)	BIT_OR(2)	BIT_XOR(2)	COUNT(*)	COUNT(12)	COUNT(DISTINCT 12)	MIN(2)	MAX(2)	STD(2)	VARIANCE(2)	SUM(2)	GROUP_CONCAT(2)	GROUP_CONCAT(DISTINCT 2)
873
2.00000	2	2	2	1	1	1	2	2	0.00000	0.00000	2	2	2
874
DROP TABLE t1;
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909
create table t2 (ff double);
insert into t2 values (2.2);
select cast(sum(distinct ff) as decimal(5,2)) from t2;
cast(sum(distinct ff) as decimal(5,2))
2.20
select cast(sum(distinct ff) as signed) from t2;
cast(sum(distinct ff) as signed)
2
select cast(variance(ff) as decimal(10,3)) from t2;
cast(variance(ff) as decimal(10,3))
0.000
select cast(min(ff) as decimal(5,2)) from t2;
cast(min(ff) as decimal(5,2))
2.20
create table t1 (df decimal(5,1));
insert into t1 values(1.1);
insert into t1 values(2.2);
select cast(sum(distinct df) as signed) from t1;
cast(sum(distinct df) as signed)
3
select cast(min(df) as signed) from t1;
cast(min(df) as signed)
0
select 1e8 * sum(distinct df) from t1;
1e8 * sum(distinct df)
330000000
select 1e8 * min(df) from t1;
1e8 * min(df)
110000000
create table t3 (ifl int);
insert into t3 values(1), (2);
select cast(min(ifl) as decimal(5,2)) from t3;
cast(min(ifl) as decimal(5,2))
1.00
drop table t1, t2, t3;
910 911 912 913 914 915
CREATE TABLE t1 (id int(11),value1 float(10,2));
INSERT INTO t1 VALUES (1,0.00),(1,1.00), (1,2.00), (2,10.00), (2,11.00), (2,12.00), (2,13.00);
select id, stddev_pop(value1), var_pop(value1), stddev_samp(value1), var_samp(value1) from t1 group by id;
id	stddev_pop(value1)	var_pop(value1)	stddev_samp(value1)	var_samp(value1)
1	0.816497	0.666667	1.000000	1.000000
2	1.118034	1.250000	1.290994	1.666667
916
DROP TABLE t1;
917 918 919 920 921
CREATE TABLE t1 (col1 decimal(16,12));
INSERT INTO t1 VALUES (-5.00000000001),(-5.00000000002),(-5.00000000003),(-5.00000000000),(-5.00000000001),(-5.00000000002);
insert into t1 select * from t1;
select col1,count(col1),sum(col1),avg(col1) from t1 group by col1;
col1	count(col1)	sum(col1)	avg(col1)
922 923 924 925
-5.000000000030	2	-10.000000000060	-5.00000000003000000
-5.000000000020	4	-20.000000000080	-5.00000000002000000
-5.000000000010	4	-20.000000000040	-5.00000000001000000
-5.000000000000	2	-10.000000000000	-5.00000000000000000
926
DROP TABLE t1;
927 928 929 930 931 932 933 934 935 936 937 938 939
create table t1 (col1 decimal(16,12));
insert into t1 values (-5.00000000001);
insert into t1 values (-5.00000000001);
select col1,sum(col1),max(col1),min(col1) from t1 group by col1;
col1	sum(col1)	max(col1)	min(col1)
-5.000000000010	-10.000000000020	-5.000000000010	-5.000000000010
delete from t1;
insert into t1 values (5.00000000001);
insert into t1 values (5.00000000001);
select col1,sum(col1),max(col1),min(col1) from t1 group by col1;
col1	sum(col1)	max(col1)	min(col1)
5.000000000010	10.000000000020	5.000000000010	5.000000000010
DROP TABLE t1;
940 941 942 943 944 945 946
CREATE TABLE t1 (a VARCHAR(400));
INSERT INTO t1 (a) VALUES ("A"), ("a"), ("a "), ("a   "),
("B"), ("b"), ("b "), ("b   ");
SELECT COUNT(DISTINCT a) FROM t1;
COUNT(DISTINCT a)
2
DROP TABLE t1;
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
CREATE TABLE t1 (a int, b int, c int);
INSERT INTO t1 (a, b, c) VALUES
(1,1,1), (1,1,2), (1,1,3),
(1,2,1), (1,2,2), (1,2,3),
(1,3,1), (1,3,2), (1,3,3),
(2,1,1), (2,1,2), (2,1,3),
(2,2,1), (2,2,2), (2,2,3),
(2,3,1), (2,3,2), (2,3,3),
(3,1,1), (3,1,2), (3,1,3),
(3,2,1), (3,2,2), (3,2,3),
(3,3,1), (3,3,2), (3,3,3);
SELECT b/c as v, a FROM t1 ORDER BY v;
v	a
0.33333	3
0.33333	1
0.33333	2
0.50000	1
0.50000	2
0.50000	3
0.66667	2
0.66667	1
0.66667	3
1.00000	3
1.00000	2
1.00000	3
1.00000	1
1.00000	2
1.00000	3
1.00000	2
1.00000	1
1.00000	1
1.50000	3
1.50000	2
1.50000	1
2.00000	1
2.00000	3
2.00000	2
3.00000	3
3.00000	2
3.00000	1
SELECT b/c as v, SUM(a) FROM t1 GROUP BY v;
v	SUM(a)
0.33333	6
0.50000	6
0.66667	6
1.00000	18
1.50000	6
2.00000	6
3.00000	6
SELECT SUM(a) FROM t1 GROUP BY b/c;
SUM(a)
6
6
6
18
6
6
6
DROP TABLE t1;
1006
set div_precision_increment= @sav_dpi;
1007 1008 1009 1010 1011 1012 1013 1014 1015
CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
INSERT INTO t1 VALUES (1,1), (2,2);
CREATE TABLE t2 (a INT PRIMARY KEY, b INT);
INSERT INTO t2 VALUES (1,1), (3,3);
SELECT SQL_NO_CACHE 
(SELECT SUM(c.a) FROM t1 ttt, t2 ccc 
WHERE ttt.a = ccc.b AND ttt.a = t.a GROUP BY ttt.a) AS minid   
FROM t1 t, t2 c WHERE t.a = c.b;
minid
1016
1
1017
DROP TABLE t1,t2;
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
create table t1 select variance(0);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `variance(0)` double(8,4) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
create table t1 select stddev(0);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `stddev(0)` double(8,4) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
create table bug22555 (i smallint primary key auto_increment, s1 smallint, s2 smallint, e decimal(30,10), o double);
insert into bug22555 (s1, s2, e, o) values (53, 78, 11.4276528, 6.828112), (17, 78, 5.916793, 1.8502951), (18, 76, 2.679231, 9.17975591), (31, 62, 6.07831, 0.1), (19, 41, 5.37463, 15.1), (83, 73, 14.567426, 7.959222), (92, 53, 6.10151, 13.1856852), (7, 12, 13.92272, 3.442007), (92, 35, 11.95358909, 6.01376678), (38, 84, 2.572, 7.904571);
select std(s1/s2) from bug22555 group by i;
std(s1/s2)
0.00000000
0.00000000
0.00000000
0.00000000
0.00000000
0.00000000
0.00000000
0.00000000
0.00000000
0.00000000
select std(e) from bug22555 group by i;
std(e)
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
0.00000000000000
select std(o) from bug22555 group by i;
std(o)
0
0
0
0
0
0
0
0
0
0
drop table bug22555;
create table bug22555 (i smallint, s1 smallint, s2 smallint, o1 double, o2 double, e1 decimal, e2 decimal);
insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76);
select i, count(*) from bug22555 group by i;
i	count(*)
1	1
2	1
3	1
select std(s1/s2) from bug22555 where i=1;
std(s1/s2)
0.00000000
select std(s1/s2) from bug22555 where i=2;
std(s1/s2)
0.00000000
select std(s1/s2) from bug22555 where i=3;
std(s1/s2)
0.00000000
select std(s1/s2) from bug22555 where i=1 group by i;
std(s1/s2)
0.00000000
select std(s1/s2) from bug22555 where i=2 group by i;
std(s1/s2)
0.00000000
select std(s1/s2) from bug22555 where i=3 group by i;
std(s1/s2)
0.00000000
select std(s1/s2) from bug22555 group by i order by i;
std(s1/s2)
0.00000000
0.00000000
0.00000000
select i, count(*), std(o1/o2) from bug22555 group by i order by i;
i	count(*)	std(o1/o2)
1	1	0
2	1	0
3	1	0
select i, count(*), std(e1/e2) from bug22555 group by i order by i;
i	count(*)	std(e1/e2)
1	1	0.00000000
2	1	0.00000000
3	1	0.00000000
set @saved_div_precision_increment=@@div_precision_increment;
set div_precision_increment=19;
select i, count(*), variance(s1/s2) from bug22555 group by i order by i;
i	count(*)	variance(s1/s2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
select i, count(*), variance(o1/o2) from bug22555 group by i order by i;
i	count(*)	variance(o1/o2)
1	1	0
2	1	0
3	1	0
select i, count(*), variance(e1/e2) from bug22555 group by i order by i;
i	count(*)	variance(e1/e2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
select i, count(*), std(s1/s2) from bug22555 group by i order by i;
i	count(*)	std(s1/s2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
select i, count(*), std(o1/o2) from bug22555 group by i order by i;
i	count(*)	std(o1/o2)
1	1	0
2	1	0
3	1	0
select i, count(*), std(e1/e2) from bug22555 group by i order by i;
i	count(*)	std(e1/e2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
set div_precision_increment=20;
select i, count(*), variance(s1/s2) from bug22555 group by i order by i;
i	count(*)	variance(s1/s2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
select i, count(*), variance(o1/o2) from bug22555 group by i order by i;
i	count(*)	variance(o1/o2)
1	1	0
2	1	0
3	1	0
select i, count(*), variance(e1/e2) from bug22555 group by i order by i;
i	count(*)	variance(e1/e2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
select i, count(*), std(s1/s2) from bug22555 group by i order by i;
i	count(*)	std(s1/s2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
select i, count(*), std(o1/o2) from bug22555 group by i order by i;
i	count(*)	std(o1/o2)
1	1	0
2	1	0
3	1	0
select i, count(*), std(e1/e2) from bug22555 group by i order by i;
i	count(*)	std(e1/e2)
1	1	0.000000000000000000000000000000
2	1	0.000000000000000000000000000000
3	1	0.000000000000000000000000000000
set @@div_precision_increment=@saved_div_precision_increment;
insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76);
insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76);
insert into bug22555 values (1,53,78,53,78,53,78),(2,17,78,17,78,17,78),(3,18,76,18,76,18,76);
select i, count(*), std(s1/s2) from bug22555 group by i order by i;
i	count(*)	std(s1/s2)
1	4	0.00000000
2	4	0.00000000
3	4	0.00000000
1183 1184 1185 1186 1187
select i, count(*), round(std(o1/o2), 16) from bug22555 group by i order by i;
i	count(*)	round(std(o1/o2), 16)
1	4	0.0000000000000000
2	4	0.0000000000000000
3	4	0.0000000000000000
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
select i, count(*), std(e1/e2) from bug22555 group by i order by i;
i	count(*)	std(e1/e2)
1	4	0.00000000
2	4	0.00000000
3	4	0.00000000
select std(s1/s2) from bug22555;
std(s1/s2)
0.21325764
select std(o1/o2) from bug22555;
std(o1/o2)
0.21325763586649
select std(e1/e2) from bug22555;
std(e1/e2)
0.21325764
set @saved_div_precision_increment=@@div_precision_increment;
set div_precision_increment=19;
select i, count(*), std(s1/s2) from bug22555 group by i order by i;
i	count(*)	std(s1/s2)
1	4	0.000000000000000000000000000000
2	4	0.000000000000000000000000000000
3	4	0.000000000000000000000000000000
1209 1210 1211 1212 1213
select i, count(*), round(std(o1/o2), 16) from bug22555 group by i order by i;
i	count(*)	round(std(o1/o2), 16)
1	4	0.0000000000000000
2	4	0.0000000000000000
3	4	0.0000000000000000
1214 1215 1216 1217 1218
select i, count(*), std(e1/e2) from bug22555 group by i order by i;
i	count(*)	std(e1/e2)
1	4	0.000000000000000000000000000000
2	4	0.000000000000000000000000000000
3	4	0.000000000000000000000000000000
1219 1220 1221
select round(std(s1/s2), 17) from bug22555;
round(std(s1/s2), 17)
0.21325763586649341
1222 1223 1224
select std(o1/o2) from bug22555;
std(o1/o2)
0.21325763586649
1225 1226 1227
select round(std(e1/e2), 17) from bug22555;
round(std(e1/e2), 17)
0.21325763586649341
1228 1229 1230 1231 1232 1233
set div_precision_increment=20;
select i, count(*), std(s1/s2) from bug22555 group by i order by i;
i	count(*)	std(s1/s2)
1	4	0.000000000000000000000000000000
2	4	0.000000000000000000000000000000
3	4	0.000000000000000000000000000000
1234 1235 1236 1237 1238
select i, count(*), round(std(o1/o2), 16) from bug22555 group by i order by i;
i	count(*)	round(std(o1/o2), 16)
1	4	0.0000000000000000
2	4	0.0000000000000000
3	4	0.0000000000000000
1239 1240 1241 1242 1243
select i, count(*), std(e1/e2) from bug22555 group by i order by i;
i	count(*)	std(e1/e2)
1	4	0.000000000000000000000000000000
2	4	0.000000000000000000000000000000
3	4	0.000000000000000000000000000000
1244 1245 1246
select round(std(s1/s2), 17) from bug22555;
round(std(s1/s2), 17)
0.21325763586649341
1247 1248 1249
select std(o1/o2) from bug22555;
std(o1/o2)
0.21325763586649
1250 1251 1252
select round(std(e1/e2), 17) from bug22555;
round(std(e1/e2), 17)
0.21325763586649341
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
set @@div_precision_increment=@saved_div_precision_increment;
drop table bug22555;
create table bug22555 (s smallint, o double, e decimal);
insert into bug22555 values (1,1,1),(2,2,2),(3,3,3),(6,6,6),(7,7,7);
select var_samp(s), var_pop(s) from bug22555;
var_samp(s)	var_pop(s)
6.7000	5.3600
select var_samp(o), var_pop(o) from bug22555;
var_samp(o)	var_pop(o)
6.7	5.36
select var_samp(e), var_pop(e) from bug22555;
var_samp(e)	var_pop(e)
6.7000	5.3600
drop table bug22555;
create table bug22555 (s smallint, o double, e decimal);
insert into bug22555 values (null,null,null),(null,null,null);
select var_samp(s) as 'null', var_pop(s) as 'null' from bug22555;
null	null
NULL	NULL
select var_samp(o) as 'null', var_pop(o) as 'null' from bug22555;
null	null
NULL	NULL
select var_samp(e) as 'null', var_pop(e) as 'null' from bug22555;
null	null
NULL	NULL
insert into bug22555 values (1,1,1);
select var_samp(s) as 'null', var_pop(s) as '0' from bug22555;
null	0
NULL	0.0000
select var_samp(o) as 'null', var_pop(o) as '0' from bug22555;
null	0
NULL	0
select var_samp(e) as 'null', var_pop(e) as '0' from bug22555;
null	0
NULL	0.0000
insert into bug22555 values (2,2,2);
select var_samp(s) as '0.5', var_pop(s) as '0.25' from bug22555;
0.5	0.25
0.5000	0.2500
select var_samp(o) as '0.5', var_pop(o) as '0.25' from bug22555;
0.5	0.25
0.5	0.25
select var_samp(e) as '0.5', var_pop(e) as '0.25' from bug22555;
0.5	0.25
0.5000	0.2500
drop table bug22555;
1299 1300 1301 1302 1303 1304 1305 1306 1307
create table t1 (a decimal(20));
insert into t1 values (12345678901234567890);
select count(a) from t1;
count(a)
1
select count(distinct a) from t1;
count(distinct a)
1
drop table t1;
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1,1),(1,2),(1,3),(1,4),(1,5),(1,6),(1,7),(1,8);
INSERT INTO t1 SELECT a, b+8       FROM t1;
INSERT INTO t1 SELECT a, b+16      FROM t1;
INSERT INTO t1 SELECT a, b+32      FROM t1;
INSERT INTO t1 SELECT a, b+64      FROM t1;
INSERT INTO t1 SELECT a, b+128     FROM t1;
INSERT INTO t1 SELECT a, b+256     FROM t1;
INSERT INTO t1 SELECT a, b+512     FROM t1;
INSERT INTO t1 SELECT a, b+1024    FROM t1;
INSERT INTO t1 SELECT a, b+2048    FROM t1;
INSERT INTO t1 SELECT a, b+4096    FROM t1;
INSERT INTO t1 SELECT a, b+8192    FROM t1;
INSERT INTO t1 SELECT a, b+16384   FROM t1;
INSERT INTO t1 SELECT a, b+32768   FROM t1;
SELECT a,COUNT(DISTINCT b) AS cnt FROM t1 GROUP BY a HAVING cnt > 50;
a	cnt
1	65536
SELECT a,SUM(DISTINCT b) AS sumation FROM t1 GROUP BY a HAVING sumation > 50;
a	sumation
1	2147516416
SELECT a,AVG(DISTINCT b) AS average FROM t1 GROUP BY a HAVING average > 50;
a	average
1	32768.5000
DROP TABLE t1;
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379
CREATE TABLE t1 ( a INT, b INT, KEY(a) );
INSERT INTO t1 VALUES (NULL, 1), (NULL, 2);
EXPLAIN SELECT MIN(a), MIN(b) FROM t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
SELECT MIN(a), MIN(b) FROM t1;
MIN(a)	MIN(b)
NULL	1
CREATE TABLE t2( a INT, b INT, c INT, KEY(a, b) );
INSERT INTO t2 ( a, b, c ) VALUES ( 1, NULL, 2 ), ( 1, 3, 4 ), ( 1, 4, 4 );
EXPLAIN SELECT MIN(b), MIN(c) FROM t2 WHERE a = 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ref	a	a	5	const	2	Using where
SELECT MIN(b), MIN(c) FROM t2 WHERE a = 1;
MIN(b)	MIN(c)
3	2
CREATE TABLE t3 (a INT, b INT, c int, KEY(a, b));
INSERT INTO t3 VALUES (1, NULL, 1), (2, NULL, 2),  (2, NULL, 2),  (3, NULL, 3);
EXPLAIN SELECT MIN(a), MIN(b) FROM t3 where a = 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MIN(a), MIN(b) FROM t3 where a = 2;
MIN(a)	MIN(b)
2	NULL
CREATE TABLE t4 (a INT, b INT, c int, KEY(a, b));
INSERT INTO t4 VALUES (1, 1, 1), (2, NULL, 2),  (2, NULL, 2),  (3, 1, 3);
EXPLAIN SELECT MIN(a), MIN(b) FROM t4 where a = 2;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MIN(a), MIN(b) FROM t4 where a = 2;
MIN(a)	MIN(b)
2	NULL
SELECT MIN(b), min(c) FROM t4 where a = 2;
MIN(b)	min(c)
NULL	2
CREATE TABLE t5( a INT, b INT, KEY( a, b) );
INSERT INTO t5 VALUES( 1, 1 ), ( 1, 2 );
EXPLAIN SELECT MIN(a), MIN(b) FROM t5 WHERE a = 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
SELECT MIN(a), MIN(b) FROM t5 WHERE a = 1;
MIN(a)	MIN(b)
1	1
SELECT MIN(a), MIN(b) FROM t5 WHERE a = 1 and b > 1;
MIN(a)	MIN(b)
1	2
DROP TABLE t1, t2, t3, t4, t5;
1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
CREATE TABLE t1 (a INT);
INSERT INTO t1 values (),(),();
SELECT (SELECT SLEEP(0) FROM t1 ORDER BY AVG(DISTINCT a) ) as x FROM t1 
GROUP BY x;
x
0
SELECT 1 FROM t1 GROUP BY (SELECT SLEEP(0) FROM t1 ORDER BY AVG(DISTINCT a) );
1
1
DROP TABLE t1;
1390 1391 1392 1393 1394
CREATE TABLE t1 (a int, b date NOT NULL, KEY k1 (a,b));
SELECT MIN(b) FROM t1 WHERE a=1 AND b>'2007-08-01';
MIN(b)
NULL
DROP TABLE t1;
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3),(4);
SET SQL_MODE=ONLY_FULL_GROUP_BY;
SELECT a FROM t1 HAVING COUNT(*)>2;
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SELECT COUNT(*), a FROM t1;
ERROR 42000: Mixing of GROUP columns (MIN(),MAX(),COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause
SET SQL_MODE=DEFAULT;
SELECT a FROM t1 HAVING COUNT(*)>2;
a
1
SELECT COUNT(*), a FROM t1;
COUNT(*)	a
4	1
DROP TABLE t1;
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421
set SQL_MODE=ONLY_FULL_GROUP_BY;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3),(4);
CREATE VIEW v1 AS SELECT a,(a + 1) AS y FROM t1;
EXPLAIN EXTENDED SELECT y FROM v1 GROUP BY v1.y;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using temporary; Using filesort
Warnings:
Note	1003	select (`test`.`t1`.`a` + 1) AS `y` from `test`.`t1` group by (`test`.`t1`.`a` + 1)
DROP VIEW v1;
DROP TABLE t1;
SET SQL_MODE=DEFAULT;
1422
End of 5.0 tests