select.result

DROP TABLE IF EXISTS t;
CREATE TABLE t (
c1 int,
c2 int,
c3 int,
PRIMARY KEY (c1)
);
INSERT INTO t VALUES (1,2,3);
set session tidb_hashagg_partial_concurrency = 1;
set session tidb_hashagg_final_concurrency = 1;
SELECT * from t;
c1	c2	c3
1	2	3
SELECT c1, c2, c3 from t;
c1	c2	c3
1	2	3
SELECT c1, c1 from t;
c1	c1
1	1
SELECT c1 as a, c2 as a from t;
a	a
1	2
SELECT 1;
1
1
SELECT 1, 1;
1	1
1	1
SET @@autocommit = 1;
SELECT @@autocommit;
@@autocommit
1
SELECT @@autocommit, @@autocommit;
@@autocommit	@@autocommit
1	1
SET @a = 10;
SET @b = 11;
SELECT @a, @@autocommit;
@a	@@autocommit
10	1
SELECT @a, @b;
@a	@b
10	11
SELECT 1, @a;
1	@a
1	10
SELECT 1, @a as a;
1	a
1	10
SELECT 1, @a, @@autocommit as a, c1 from t;
1	@a	a	c1
1	10	1	1
SET @b = "123";
SELECT @b + "123";
@b + "123"
246
SELECT 1 + 1;
1 + 1
2
SELECT 1 a, 1 as a, 1 + 1 a;
a	a	a
1	1	2
SELECT c1 a, c1 as a from t;
a	a
1	1
SELECT * from t LIMIT 0,1;
c1	c2	c3
1	2	3
SELECT * from t LIMIT 1;
c1	c2	c3
1	2	3
SELECT * from t LIMIT 1,1;
c1	c2	c3
SELECT * from t LIMIT 1 OFFSET 0;
c1	c2	c3
1	2	3
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (
c1 int,
c2 int,
PRIMARY KEY (c1)
);
INSERT INTO t2 VALUES (1,2);
SELECT * from t a;
c1	c2	c3
1	2	3
SELECT * from t a, t2 b;
c1	c2	c3	c1	c2
1	2	3	1	2
SELECT * from t as a, t2 as b;
c1	c2	c3	c1	c2
1	2	3	1	2
SELECT * from t a left join t2 b on a.c1 = b.c1;
c1	c2	c3	c1	c2
1	2	3	1	2
SELECT * from (SELECT 1, 1) as a;
Error 1060: Duplicate column name '1'
SELECT * from (SELECT * FROM t, t2) as a;
Error 1060: Duplicate column name 'c1'
DROP TABLE IF EXISTS t;
CREATE TABLE t (c1 INT, c2 INT);
INSERT INTO t VALUES (1, 2), (1, 1), (1, 3);
SELECT c1=c2 FROM t;
c1=c2
0
1
0
SELECT 1=1;
1=1
1
SELECT t.c1 + t.c2 from t limit 1;
t.c1 + t.c2
3
SELECT t.c1 from t limit 1;
c1
1
SELECT t.c1 + c2 from t limit 1;
t.c1 + c2
3
SELECT c1 + 10 from t limit 1;
c1 + 10
11
SELECT t.c1 + 10 from t limit 1;
t.c1 + 10
11
SELECT all c1, c2 from t limit 1;
c1	c2
1	2
SELECT distinct c1, c2 from t order by c1, c2 limit 1;
c1	c2
1	1
SELECT c2 from t where not (c2 > 2);
c2
2
1
select c2 from t where not null is null;
c2
select !(1 + 2);
!(1 + 2)
0
select + - 1, --1, +-+-+1, + "123";
+ - 1	--1	+-+-+1	123
-1	1	1	123
select --------------------1, ++++++++++++++++++++1;
--------------------1	1
1	1
select +(+(1)), (-+1), ((+1)), +1.23, +1e23, +1E23, +null, +true, +false, + ( ( 1 ) );
1	(-+1)	1	1.23	1e23	1E23	NULL	TRUE	FALSE	1
1	-1	1	1.23	1e23	1e23	NULL	1	0	1
select +
(
+
(
1
)
)
;
1
1
select +	(	+	1	);
1
1
select --+(1 + 1), +-+-(1 * 1);
--+(1 + 1)	+-+-(1 * 1)
2	1
select * from t where null;
c1	c2
select * from t where 1;
c1	c2
1	2
1	1
1	3
select * from t where 0;
c1	c2
select * from t where 0 * 10;
c1	c2
select * from t where null is not null;
c1	c2
select * from t where !1;
c1	c2
select * from t where 1 && 0 || 3 && null;
c1	c2
select * from t as a, t2 as b;
c1	c2	c1	c2
1	2	1	2
1	1	1	2
1	3	1	2
select * from t as a cross join t2 as b;
c1	c2	c1	c2
1	2	1	2
1	1	1	2
1	3	1	2
select * from t as a join t2 as b;
c1	c2	c1	c2
1	2	1	2
1	1	1	2
1	3	1	2
select * from t as a join t2 as b on a.c2 = b.c2;
c1	c2	c1	c2
1	2	1	2
select * from (t);
c1	c2
1	2
1	1
1	3
select * from (t as a, t2 as b);
c1	c2	c1	c2
1	2	1	2
1	1	1	2
1	3	1	2
select * from (t as a cross join t2 as b);
c1	c2	c1	c2
1	2	1	2
1	1	1	2
1	3	1	2
select 1 as a from t;
a
1
1
1
select count(*), 1 from t;
count(*)	1
3	1
select *, 1 from t;
c1	c2	1
1	2	1
1	1	1
1	3	1
select 1, count(1), sum(1);
1	count(1)	sum(1)
1	1	1
drop table if exists t1;
create table t1(a int primary key, b int, c int, index idx(b, c));
insert into t1 values(1, 2, 3);
insert into t1 values(2, 3, 4);
insert into t1 values(3 ,4, 5);
insert into t1 values(4, 5, 6);
insert into t1 values(5, 6, 7);
insert into t1 values(6, 7, 8);
insert into t1 values(7, 8, 9);
insert into t1 values(9, 10, 11);
explain select a, c from t1 use index(idx) order by a limit 5;
id	count	task	operator info
TopN_7	5.00	root	Column#1:asc, offset:0, count:5
└─IndexReader_15	5.00	root	index:TopN_14
  └─TopN_14	5.00	cop[tikv]	Column#1:asc, offset:0, count:5
    └─IndexScan_13	10000.00	cop[tikv]	table:t1, index:b, c, range:[NULL,+inf], keep order:false, stats:pseudo
select c, a from t1 use index(idx) order by a limit 5;
c	a
3	1
4	2
5	3
6	4
7	5
drop table if exists t;
create table t (a int, b int, c int, key idx(a, b, c));
explain select count(a) from t;
id	count	task	operator info
StreamAgg_20	1.00	root	funcs:count(Column#8)
└─IndexReader_21	1.00	root	index:StreamAgg_8
  └─StreamAgg_8	1.00	cop[tikv]	funcs:count(Column#1)
    └─IndexScan_19	10000.00	cop[tikv]	table:t, index:a, b, c, range:[NULL,+inf], keep order:false, stats:pseudo
select count(a) from t;
count(a)
0
insert t values(0,0,0);
explain select distinct b from t group by a;
id	count	task	operator info
HashAgg_7	8000.00	root	group by:Column#2, funcs:firstrow(Column#2)
└─StreamAgg_22	8000.00	root	group by:Column#9, funcs:firstrow(Column#8)
  └─IndexReader_23	8000.00	root	index:StreamAgg_11
    └─StreamAgg_11	8000.00	cop[tikv]	group by:Column#1, funcs:firstrow(Column#2)
      └─IndexScan_21	10000.00	cop[tikv]	table:t, index:a, b, c, range:[NULL,+inf], keep order:true, stats:pseudo
select distinct b from t group by a;
b
0
explain select count(b) from t group by a;
id	count	task	operator info
StreamAgg_19	8000.00	root	group by:Column#10, funcs:count(Column#9)
└─IndexReader_20	8000.00	root	index:StreamAgg_8
  └─StreamAgg_8	8000.00	cop[tikv]	group by:Column#1, funcs:count(Column#2)
    └─IndexScan_18	10000.00	cop[tikv]	table:t, index:a, b, c, range:[NULL,+inf], keep order:true, stats:pseudo
select count(b) from t group by a;
count(b)
1
insert t values(1,1,1),(3,3,6),(3,2,5),(2,1,4),(1,1,3),(1,1,2);
explain select count(a) from t where b>0 group by a, b;
id	count	task	operator info
StreamAgg_25	2666.67	root	group by:Column#11, Column#12, funcs:count(Column#10)
└─IndexReader_26	2666.67	root	index:StreamAgg_9
  └─StreamAgg_9	2666.67	cop[tikv]	group by:Column#1, Column#2, funcs:count(Column#1)
    └─Selection_24	3333.33	cop[tikv]	gt(Column#2, 0)
      └─IndexScan_23	10000.00	cop[tikv]	table:t, index:a, b, c, range:[NULL,+inf], keep order:true, stats:pseudo
select count(a) from t where b>0 group by a, b;
count(a)
3
1
1
1
explain select count(a) from t where b>0 group by a, b order by a;
id	count	task	operator info
Projection_7	2666.67	root	Column#5
└─StreamAgg_36	2666.67	root	group by:Column#19, Column#20, funcs:count(Column#17), firstrow(Column#19)
  └─IndexReader_37	2666.67	root	index:StreamAgg_34
    └─StreamAgg_34	2666.67	cop[tikv]	group by:Column#1, Column#2, funcs:count(Column#1)
      └─Selection_28	3333.33	cop[tikv]	gt(Column#2, 0)
        └─IndexScan_27	10000.00	cop[tikv]	table:t, index:a, b, c, range:[NULL,+inf], keep order:true, stats:pseudo
select count(a) from t where b>0 group by a, b order by a;
count(a)
3
1
1
1
explain select count(a) from t where b>0 group by a, b order by a limit 1;
id	count	task	operator info
Projection_9	1.00	root	Column#5
└─Limit_15	1.00	root	offset:0, count:1
  └─StreamAgg_44	1.00	root	group by:Column#19, Column#20, funcs:count(Column#17), firstrow(Column#19)
    └─IndexReader_45	1.00	root	index:StreamAgg_40
      └─StreamAgg_40	1.00	cop[tikv]	group by:Column#1, Column#2, funcs:count(Column#1)
        └─Selection_43	1.25	cop[tikv]	gt(Column#2, 0)
          └─IndexScan_42	3.75	cop[tikv]	table:t, index:a, b, c, range:[NULL,+inf], keep order:true, stats:pseudo
select count(a) from t where b>0 group by a, b order by a limit 1;
count(a)
3
drop table if exists t;
create table t (id int primary key, a int, b int);
explain select * from (t t1 left join t t2 on t1.a = t2.a) left join (t t3 left join t t4 on t3.a = t4.a) on t2.b = 1;
id	count	task	operator info
HashLeftJoin_10	155937656.25	root	CARTESIAN left outer join, inner:HashLeftJoin_17, left cond:[eq(Column#6, 1)]
├─HashLeftJoin_11	12487.50	root	left outer join, inner:TableReader_16, equal:[eq(Column#2, Column#5)]
│ ├─TableReader_13	10000.00	root	data:TableScan_12
│ │ └─TableScan_12	10000.00	cop[tikv]	table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
│ └─TableReader_16	9990.00	root	data:Selection_15
│   └─Selection_15	9990.00	cop[tikv]	not(isnull(Column#5))
│     └─TableScan_14	10000.00	cop[tikv]	table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
└─HashLeftJoin_17	12487.50	root	left outer join, inner:TableReader_22, equal:[eq(Column#8, Column#11)]
  ├─TableReader_19	10000.00	root	data:TableScan_18
  │ └─TableScan_18	10000.00	cop[tikv]	table:t3, range:[-inf,+inf], keep order:false, stats:pseudo
  └─TableReader_22	9990.00	root	data:Selection_21
    └─Selection_21	9990.00	cop[tikv]	not(isnull(Column#11))
      └─TableScan_20	10000.00	cop[tikv]	table:t4, range:[-inf,+inf], keep order:false, stats:pseudo
drop table if exists t;
create table t(a bigint primary key, b bigint);
desc select * from t where a = 1;
id	count	task	operator info
Point_Get_1	1.00	root	table:t, handle:1
desc select * from t where a = '1';
id	count	task	operator info
Point_Get_1	1.00	root	table:t, handle:1
desc select sysdate(), sleep(1), sysdate();
id	count	task	operator info
Projection_3	1.00	root	sysdate(), sleep(1), sysdate()
└─TableDual_4	1.00	root	rows:1
drop table if exists th;
set @@session.tidb_enable_table_partition = '1';
create table th (a int, b int) partition by hash(a) partitions 3;
insert into th values (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8);
insert into th values (-1,-1),(-2,-2),(-3,-3),(-4,-4),(-5,-5),(-6,-6),(-7,-7),(-8,-8);
desc select * from th where a=-2;
id	count	task	operator info
TableReader_8	10.00	root	data:Selection_7
└─Selection_7	10.00	cop[tikv]	eq(Column#1, -2)
  └─TableScan_6	10000.00	cop[tikv]	table:th, partition:p2, range:[-inf,+inf], keep order:false, stats:pseudo
desc select * from th;
id	count	task	operator info
Union_8	30000.00	root	
├─TableReader_10	10000.00	root	data:TableScan_9
│ └─TableScan_9	10000.00	cop[tikv]	table:th, partition:p0, range:[-inf,+inf], keep order:false, stats:pseudo
├─TableReader_12	10000.00	root	data:TableScan_11
│ └─TableScan_11	10000.00	cop[tikv]	table:th, partition:p1, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_14	10000.00	root	data:TableScan_13
  └─TableScan_13	10000.00	cop[tikv]	table:th, partition:p2, range:[-inf,+inf], keep order:false, stats:pseudo
desc select * from th partition (p2,p1);
id	count	task	operator info
Union_7	20000.00	root	
├─TableReader_9	10000.00	root	data:TableScan_8
│ └─TableScan_8	10000.00	cop[tikv]	table:th, partition:p1, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_11	10000.00	root	data:TableScan_10
  └─TableScan_10	10000.00	cop[tikv]	table:th, partition:p2, range:[-inf,+inf], keep order:false, stats:pseudo
drop table if exists t;
create table t(a int, b int);
explain select a != any (select a from t t2) from t t1;
id	count	task	operator info
Projection_8	10000.00	root	and(or(or(gt(Column#9, 1), ne(Column#1, Column#8)), if(ne(Column#10, 0), NULL, 0)), and(ne(Column#11, 0), if(isnull(Column#1), NULL, 1)))
└─HashLeftJoin_9	10000.00	root	CARTESIAN inner join, inner:StreamAgg_16
  ├─TableReader_12	10000.00	root	data:TableScan_11
  │ └─TableScan_11	10000.00	cop[tikv]	table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
  └─StreamAgg_16	1.00	root	funcs:firstrow(Column#15), count(distinct Column#16), sum(Column#17), count(1)
    └─Projection_26	10000.00	root	Column#4, Column#4, cast(isnull(Column#4))
      └─TableReader_23	10000.00	root	data:TableScan_22
        └─TableScan_22	10000.00	cop[tikv]	table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
explain select a = all (select a from t t2) from t t1;
id	count	task	operator info
Projection_8	10000.00	root	or(and(and(le(Column#9, 1), eq(Column#1, Column#8)), if(ne(Column#10, 0), NULL, 1)), or(eq(Column#11, 0), if(isnull(Column#1), NULL, 0)))
└─HashLeftJoin_9	10000.00	root	CARTESIAN inner join, inner:StreamAgg_16
  ├─TableReader_12	10000.00	root	data:TableScan_11
  │ └─TableScan_11	10000.00	cop[tikv]	table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
  └─StreamAgg_16	1.00	root	funcs:firstrow(Column#15), count(distinct Column#16), sum(Column#17), count(1)
    └─Projection_26	10000.00	root	Column#4, Column#4, cast(isnull(Column#4))
      └─TableReader_23	10000.00	root	data:TableScan_22
        └─TableScan_22	10000.00	cop[tikv]	table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
drop table if exists t;
create table t(a int, b int);
drop table if exists s;
create table s(a varchar(20), b varchar(20));
explain select a in (select a from s where s.b = t.b) from t;
id	count	task	operator info
Projection_9	10000.00	root	Column#8
└─HashLeftJoin_10	10000.00	root	left outer semi join, inner:Projection_14, equal:[eq(Column#10, Column#11)], other cond:eq(cast(Column#1), cast(Column#4))
  ├─Projection_11	10000.00	root	Column#1, Column#2, cast(Column#2)
  │ └─TableReader_13	10000.00	root	data:TableScan_12
  │   └─TableScan_12	10000.00	cop[tikv]	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
  └─Projection_14	10000.00	root	Column#4, Column#5, cast(Column#5)
    └─TableReader_16	10000.00	root	data:TableScan_15
      └─TableScan_15	10000.00	cop[tikv]	table:s, range:[-inf,+inf], keep order:false, stats:pseudo
explain select a in (select a+b from t t2 where t2.b = t1.b) from t t1;
id	count	task	operator info
Projection_7	10000.00	root	Column#8
└─HashLeftJoin_8	10000.00	root	left outer semi join, inner:TableReader_12, equal:[eq(Column#2, Column#5)], other cond:eq(Column#1, plus(Column#4, Column#5))
  ├─TableReader_10	10000.00	root	data:TableScan_9
  │ └─TableScan_9	10000.00	cop[tikv]	table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
  └─TableReader_12	10000.00	root	data:TableScan_11
    └─TableScan_11	10000.00	cop[tikv]	table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
drop table t;
create table t(a int not null, b int);
explain select a in (select a from t t2 where t2.b = t1.b) from t t1;
id	count	task	operator info
Projection_7	10000.00	root	Column#8
└─HashLeftJoin_8	10000.00	root	left outer semi join, inner:TableReader_12, equal:[eq(Column#2, Column#5) eq(Column#1, Column#4)]
  ├─TableReader_10	10000.00	root	data:TableScan_9
  │ └─TableScan_9	10000.00	cop[tikv]	table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
  └─TableReader_12	10000.00	root	data:TableScan_11
    └─TableScan_11	10000.00	cop[tikv]	table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
explain select 1 from (select sleep(1)) t;
id	count	task	operator info
Projection_4	1.00	root	1
└─Projection_5	1.00	root	sleep(1)
  └─TableDual_6	1.00	root	rows:1
drop table if exists t;
create table t(a int, b int);
explain select a from t order by rand();
id	count	task	operator info
Projection_8	10000.00	root	Column#4
└─Sort_4	10000.00	root	Column#5:asc
  └─Projection_9	10000.00	root	Column#4, rand()
    └─TableReader_7	10000.00	root	data:TableScan_6
      └─TableScan_6	10000.00	cop[tikv]	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
explain select a, b from t order by abs(2);
id	count	task	operator info
TableReader_8	10000.00	root	data:TableScan_7
└─TableScan_7	10000.00	cop[tikv]	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
explain select a from t order by abs(rand())+1;
id	count	task	operator info
Projection_8	10000.00	root	Column#4
└─Sort_4	10000.00	root	Column#5:asc
  └─Projection_9	10000.00	root	Column#4, plus(abs(rand()), 1)
    └─TableReader_7	10000.00	root	data:TableScan_6
      └─TableScan_6	10000.00	cop[tikv]	table:t, range:[-inf,+inf], keep order:false, stats:pseudo
drop table if exists t1;
create table t1(a int, b int);
drop table if exists t2;
create table t2(a int, b int);
explain select * from t1 where t1.a in (select t2.a as a from t2 where t2.b > t1.b order by t1.b);
id	count	task	operator info
HashLeftJoin_10	7984.01	root	semi join, inner:TableReader_16, equal:[eq(Column#1, Column#4)], other cond:gt(Column#5, Column#2)
├─TableReader_13	9980.01	root	data:Selection_12
│ └─Selection_12	9980.01	cop[tikv]	not(isnull(Column#1)), not(isnull(Column#2))
│   └─TableScan_11	10000.00	cop[tikv]	table:t1, range:[-inf,+inf], keep order:false, stats:pseudo
└─TableReader_16	9980.01	root	data:Selection_15
  └─Selection_15	9980.01	cop[tikv]	not(isnull(Column#4)), not(isnull(Column#5))
    └─TableScan_14	10000.00	cop[tikv]	table:t2, range:[-inf,+inf], keep order:false, stats:pseudo
drop table t;
CREATE TABLE t (id int(10) unsigned NOT NULL AUTO_INCREMENT,
i int(10) unsigned DEFAULT NULL,
x int(10) unsigned DEFAULT 0,
PRIMARY KEY (`id`)
);
explain select row_number() over( partition by i ) - x as rnk from t;
id	count	task	operator info
Projection_7	10000.00	root	minus(Column#7, Column#3)
└─Window_8	10000.00	root	row_number() over(partition by Column#2)
  └─Sort_11	10000.00	root	Column#2:asc
    └─TableReader_10	10000.00	root	data:TableScan_9
      └─TableScan_9	10000.00	cop[tikv]	table:t, range:[0,+inf], keep order:false, stats:pseudo