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drop table if exists t1,t2;
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;
a c sum(a)
1 a 1
2 b 2
3 c 3
4 E 4
5 C 5
6 D 6
select a,c,sum(a) from t1 where a > 10 group by a;
a c sum(a)
select sum(a) from t1 where a > 10;
sum(a)
NULL
select a from t1 order by rand(10);
a
2
6
1
3
5
4
select distinct a from t1 order by rand(10);
a
2
6
1
3
5
4
select count(distinct a),count(distinct grp) from t1;
count(distinct a) count(distinct grp)
6 3
insert into t1 values (null,null,'');
select count(distinct a),count(distinct grp) from t1;
count(distinct a) count(distinct grp)
6 3
select sum(all a),count(all a),avg(all a),std(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) bit_or(all a) bit_and(all a) min(all a) max(all a) min(all c) max(all c)
21 6 3.5000 1.7078 7 0 1 6 E
select grp, sum(a),count(a),avg(a),std(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) bit_or(a) bit_and(a) min(a) max(a) min(c) max(c)
NULL NULL 0 NULL NULL 0 18446744073709551615 NULL NULL
1 1 1 1.0000 0.0000 1 1 1 1 a a
2 5 2 2.5000 0.5000 3 2 2 3 b c
3 15 3 5.0000 0.8165 7 4 4 6 C E
select grp, sum(a)+count(a)+avg(a)+std(a)+bit_or(a)+bit_and(a)+min(a)+max(a)+min(c)+max(c) as sum from t1 group by grp;
grp sum
NULL NULL
1 7
2 20
3 44.816496580928
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;
grp a c
NULL NULL
1 2 a
2 5 c
3 9 E
2 3 c
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');
select id, avg(value1), std(value1) from t1 group by id;
id avg(value1) std(value1)
1 1.000000 0.816497
2 11.000000 0.816497
select name, avg(value1), std(value1) from t1, t2 where t1.id = t2.id group by t1.id;
name avg(value1) std(value1)
Set One 1.000000 0.816497
Set Two 11.000000 0.816497
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;
id avg(rating)
1 3.0000
2 NULL
3 2.0000
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;
count(*)
3
select count(*) from t1 where a = 1;
count(*)
1
select count(*) from t1 where a = 100;
count(*)
0
select count(*) from t1 where a >= 10;
count(*)
0
select count(a) from t1 where a = 1;
count(a)
1
select count(a) from t1 where a = 100;
count(a)
0
select count(a) from t1 where a >= 10;
count(a)
0
select count(b) from t1 where b >= 2;
count(b)
2
select count(b) from t1 where b >= 10;
count(b)
0
select count(c) from t1 where c = 10;
count(c)
0
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;
COUNT(i) i COUNT(i)*i
1 1 1
SELECT COUNT(i), (i+0), COUNT(i)*(i+0) FROM t1 GROUP BY i;
COUNT(i) (i+0) COUNT(i)*(i+0)
1 1 1
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;
sum(num)
147.58
select sum(num) from t1 group by user;
sum(num)
50.15
45.63
51.80
drop table t1;
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;
Comment
Select tables optimized away
explain select max(t1.a1), max(t2.a2) from t1, t2;
Comment
No matching min/max row
insert into t2 values('AAA', 10, 0.5);
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
10 NULL AAA 10
10 bbb AAA 10
20 zzz NULL NULL
select max(t1.a2) from t1 left outer join t2 on t1.a1=10;
max(t1.a2)
zzz
select max(t1.a2) from t1 left outer join t2 on t1.a1=10 where t1.a1=20;
max(t1.a2)
zzz
select max(t1.a2) from t1 left outer join t2 on t1.a1=10 where t1.a1=10;
max(t1.a2)
bbb
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
drop table t1,t2;
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)
0 NULL NULL NULL NULL NULL 18446744073709551615 0
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
2 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
2 0 NULL NULL NULL NULL NULL 18446744073709551615 0
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
2 1 1 1.0000 0.0000 1 1 1 1
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
2 1 1 1.0000 0.0000 1 1 1 1
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
2 1 1 1.0000 0.0000 1 1 1 1
3 1 1 1.0000 0.0000 1 1 1 1
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)
1 0 NULL NULL NULL NULL NULL 18446744073709551615 0
2 1 1 1.0000 0.0000 1 1 1 1
3 1 1 1.0000 0.0000 1 1 1 1
drop table t1;
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;
create table t1 (a int);
select avg(2) from t1;
avg(2)
NULL
drop table t1;
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