You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
482 lines
17 KiB
482 lines
17 KiB
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 estRows task access object operator info
|
|
TopN_7 5.00 root test.t1.a:asc, offset:0, count:5
|
|
└─IndexReader_15 5.00 root index:TopN_14
|
|
└─TopN_14 5.00 cop[tikv] test.t1.a:asc, offset:0, count:5
|
|
└─IndexFullScan_13 10000.00 cop[tikv] table:t1, index:idx(b, c) 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 estRows task access object operator info
|
|
StreamAgg_20 1.00 root funcs:count(Column#13)->Column#5
|
|
└─TableReader_21 1.00 root data:StreamAgg_8
|
|
└─StreamAgg_8 1.00 cop[tikv] funcs:count(test.t.a)->Column#13
|
|
└─TableFullScan_18 10000.00 cop[tikv] table:t 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 estRows task access object operator info
|
|
HashAgg_7 8000.00 root group by:test.t.b, funcs:firstrow(test.t.b)->test.t.b
|
|
└─StreamAgg_22 8000.00 root group by:test.t.a, funcs:firstrow(Column#9)->test.t.b
|
|
└─IndexReader_23 8000.00 root index:StreamAgg_11
|
|
└─StreamAgg_11 8000.00 cop[tikv] group by:test.t.a, funcs:firstrow(test.t.b)->Column#9
|
|
└─IndexFullScan_21 10000.00 cop[tikv] table:t, index:idx(a, b, c) 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 estRows task access object operator info
|
|
StreamAgg_19 8000.00 root group by:test.t.a, funcs:count(Column#10)->Column#5
|
|
└─IndexReader_20 8000.00 root index:StreamAgg_8
|
|
└─StreamAgg_8 8000.00 cop[tikv] group by:test.t.a, funcs:count(test.t.b)->Column#10
|
|
└─IndexFullScan_18 10000.00 cop[tikv] table:t, index:idx(a, b, c) 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 estRows task access object operator info
|
|
StreamAgg_25 2666.67 root group by:test.t.a, test.t.b, funcs:count(Column#10)->Column#5
|
|
└─IndexReader_26 2666.67 root index:StreamAgg_9
|
|
└─StreamAgg_9 2666.67 cop[tikv] group by:test.t.a, test.t.b, funcs:count(test.t.a)->Column#10
|
|
└─Selection_24 3333.33 cop[tikv] gt(test.t.b, 0)
|
|
└─IndexFullScan_23 10000.00 cop[tikv] table:t, index:idx(a, b, c) 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 estRows task access object operator info
|
|
Projection_7 2666.67 root Column#5
|
|
└─StreamAgg_36 2666.67 root group by:test.t.a, test.t.b, funcs:count(Column#15)->Column#5, funcs:firstrow(test.t.a)->test.t.a
|
|
└─IndexReader_37 2666.67 root index:StreamAgg_34
|
|
└─StreamAgg_34 2666.67 cop[tikv] group by:test.t.a, test.t.b, funcs:count(test.t.a)->Column#15
|
|
└─Selection_28 3333.33 cop[tikv] gt(test.t.b, 0)
|
|
└─IndexFullScan_27 10000.00 cop[tikv] table:t, index:idx(a, b, c) 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 estRows task access object 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:test.t.a, test.t.b, funcs:count(Column#16)->Column#5, funcs:firstrow(test.t.a)->test.t.a
|
|
└─IndexReader_45 1.00 root index:StreamAgg_40
|
|
└─StreamAgg_40 1.00 cop[tikv] group by:test.t.a, test.t.b, funcs:count(test.t.a)->Column#16
|
|
└─Selection_43 1.25 cop[tikv] gt(test.t.b, 0)
|
|
└─IndexFullScan_42 3.75 cop[tikv] table:t, index:idx(a, b, c) 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 estRows task access object operator info
|
|
HashJoin_10 155937656.25 root CARTESIAN left outer join, left cond:[eq(test.t.b, 1)]
|
|
├─HashJoin_19(Build) 12487.50 root left outer join, equal:[eq(test.t.a, test.t.a)]
|
|
│ ├─TableReader_25(Build) 9990.00 root data:Selection_24
|
|
│ │ └─Selection_24 9990.00 cop[tikv] not(isnull(test.t.a))
|
|
│ │ └─TableFullScan_23 10000.00 cop[tikv] table:t4 keep order:false, stats:pseudo
|
|
│ └─TableReader_22(Probe) 10000.00 root data:TableFullScan_21
|
|
│ └─TableFullScan_21 10000.00 cop[tikv] table:t3 keep order:false, stats:pseudo
|
|
└─HashJoin_12(Probe) 12487.50 root left outer join, equal:[eq(test.t.a, test.t.a)]
|
|
├─TableReader_18(Build) 9990.00 root data:Selection_17
|
|
│ └─Selection_17 9990.00 cop[tikv] not(isnull(test.t.a))
|
|
│ └─TableFullScan_16 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader_15(Probe) 10000.00 root data:TableFullScan_14
|
|
└─TableFullScan_14 10000.00 cop[tikv] table:t1 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 estRows task access object operator info
|
|
Point_Get_1 1.00 root table:t handle:1
|
|
desc select * from t where a = '1';
|
|
id estRows task access object operator info
|
|
Point_Get_1 1.00 root table:t handle:1
|
|
desc select sysdate(), sleep(1), sysdate();
|
|
id estRows task access object operator info
|
|
Projection_3 1.00 root sysdate()->Column#1, sleep(1)->Column#2, sysdate()->Column#3
|
|
└─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 estRows task access object operator info
|
|
TableReader_8 10.00 root data:Selection_7
|
|
└─Selection_7 10.00 cop[tikv] eq(test.th.a, -2)
|
|
└─TableFullScan_6 10000.00 cop[tikv] table:th, partition:p2 keep order:false, stats:pseudo
|
|
desc select * from th;
|
|
id estRows task access object operator info
|
|
PartitionUnion_8 30000.00 root
|
|
├─TableReader_10 10000.00 root data:TableFullScan_9
|
|
│ └─TableFullScan_9 10000.00 cop[tikv] table:th, partition:p0 keep order:false, stats:pseudo
|
|
├─TableReader_12 10000.00 root data:TableFullScan_11
|
|
│ └─TableFullScan_11 10000.00 cop[tikv] table:th, partition:p1 keep order:false, stats:pseudo
|
|
└─TableReader_14 10000.00 root data:TableFullScan_13
|
|
└─TableFullScan_13 10000.00 cop[tikv] table:th, partition:p2 keep order:false, stats:pseudo
|
|
desc select * from th partition (p2,p1);
|
|
id estRows task access object operator info
|
|
PartitionUnion_7 20000.00 root
|
|
├─TableReader_9 10000.00 root data:TableFullScan_8
|
|
│ └─TableFullScan_8 10000.00 cop[tikv] table:th, partition:p1 keep order:false, stats:pseudo
|
|
└─TableReader_11 10000.00 root data:TableFullScan_10
|
|
└─TableFullScan_10 10000.00 cop[tikv] table:th, partition:p2 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 estRows task access object operator info
|
|
Projection_8 10000.00 root and(or(or(gt(Column#8, 1), ne(test.t.a, Column#7)), if(ne(Column#9, 0), <nil>, 0)), and(ne(Column#10, 0), if(isnull(test.t.a), <nil>, 1)))->Column#11
|
|
└─HashJoin_9 10000.00 root CARTESIAN inner join
|
|
├─StreamAgg_14(Build) 1.00 root funcs:max(Column#13)->Column#7, funcs:count(distinct Column#14)->Column#8, funcs:sum(Column#15)->Column#9, funcs:count(1)->Column#10
|
|
│ └─Projection_19 10000.00 root test.t.a, test.t.a, cast(isnull(test.t.a), decimal(65,0) BINARY)->Column#15
|
|
│ └─TableReader_18 10000.00 root data:TableFullScan_17
|
|
│ └─TableFullScan_17 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader_12(Probe) 10000.00 root data:TableFullScan_11
|
|
└─TableFullScan_11 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain select a = all (select a from t t2) from t t1;
|
|
id estRows task access object operator info
|
|
Projection_8 10000.00 root or(and(and(le(Column#8, 1), eq(test.t.a, Column#7)), if(ne(Column#9, 0), <nil>, 1)), or(eq(Column#10, 0), if(isnull(test.t.a), <nil>, 0)))->Column#11
|
|
└─HashJoin_9 10000.00 root CARTESIAN inner join
|
|
├─StreamAgg_14(Build) 1.00 root funcs:firstrow(Column#13)->Column#7, funcs:count(distinct Column#14)->Column#8, funcs:sum(Column#15)->Column#9, funcs:count(1)->Column#10
|
|
│ └─Projection_19 10000.00 root test.t.a, test.t.a, cast(isnull(test.t.a), decimal(65,0) BINARY)->Column#15
|
|
│ └─TableReader_18 10000.00 root data:TableFullScan_17
|
|
│ └─TableFullScan_17 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader_12(Probe) 10000.00 root data:TableFullScan_11
|
|
└─TableFullScan_11 10000.00 cop[tikv] table:t1 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 estRows task access object operator info
|
|
HashJoin_10 10000.00 root left outer semi join, equal:[eq(Column#8, Column#9)], other cond:eq(cast(test.t.a), cast(test.s.a))
|
|
├─Projection_14(Build) 10000.00 root test.s.a, cast(test.s.b, double BINARY)->Column#9
|
|
│ └─TableReader_16 10000.00 root data:TableFullScan_15
|
|
│ └─TableFullScan_15 10000.00 cop[tikv] table:s keep order:false, stats:pseudo
|
|
└─Projection_11(Probe) 10000.00 root test.t.a, cast(test.t.b, double BINARY)->Column#8
|
|
└─TableReader_13 10000.00 root data:TableFullScan_12
|
|
└─TableFullScan_12 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain select a in (select a+b from t t2 where t2.b = t1.b) from t t1;
|
|
id estRows task access object operator info
|
|
HashJoin_8 10000.00 root left outer semi join, equal:[eq(test.t.b, test.t.b)], other cond:eq(test.t.a, plus(test.t.a, test.t.b))
|
|
├─TableReader_12(Build) 10000.00 root data:TableFullScan_11
|
|
│ └─TableFullScan_11 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader_10(Probe) 10000.00 root data:TableFullScan_9
|
|
└─TableFullScan_9 10000.00 cop[tikv] table:t1 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 estRows task access object operator info
|
|
HashJoin_8 10000.00 root left outer semi join, equal:[eq(test.t.b, test.t.b) eq(test.t.a, test.t.a)]
|
|
├─TableReader_12(Build) 10000.00 root data:TableFullScan_11
|
|
│ └─TableFullScan_11 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader_10(Probe) 10000.00 root data:TableFullScan_9
|
|
└─TableFullScan_9 10000.00 cop[tikv] table:t1 keep order:false, stats:pseudo
|
|
explain select 1 from (select sleep(1)) t;
|
|
id estRows task access object operator info
|
|
Projection_4 1.00 root 1->Column#2
|
|
└─Projection_5 1.00 root sleep(1)->Column#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 estRows task access object operator info
|
|
Projection_8 10000.00 root test.t.a
|
|
└─Sort_4 10000.00 root Column#4:asc
|
|
└─Projection_9 10000.00 root test.t.a, rand()->Column#4
|
|
└─TableReader_7 10000.00 root data:TableFullScan_6
|
|
└─TableFullScan_6 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain select a, b from t order by abs(2);
|
|
id estRows task access object operator info
|
|
TableReader_8 10000.00 root data:TableFullScan_7
|
|
└─TableFullScan_7 10000.00 cop[tikv] table:t keep order:false, stats:pseudo
|
|
explain select a from t order by abs(rand())+1;
|
|
id estRows task access object operator info
|
|
Projection_8 10000.00 root test.t.a
|
|
└─Sort_4 10000.00 root Column#4:asc
|
|
└─Projection_9 10000.00 root test.t.a, plus(abs(rand()), 1)->Column#4
|
|
└─TableReader_7 10000.00 root data:TableFullScan_6
|
|
└─TableFullScan_6 10000.00 cop[tikv] table:t 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 estRows task access object operator info
|
|
HashJoin_10 7984.01 root semi join, equal:[eq(test.t1.a, test.t2.a)], other cond:gt(test.t2.b, test.t1.b)
|
|
├─TableReader_16(Build) 9980.01 root data:Selection_15
|
|
│ └─Selection_15 9980.01 cop[tikv] not(isnull(test.t2.a)), not(isnull(test.t2.b))
|
|
│ └─TableFullScan_14 10000.00 cop[tikv] table:t2 keep order:false, stats:pseudo
|
|
└─TableReader_13(Probe) 9980.01 root data:Selection_12
|
|
└─Selection_12 9980.01 cop[tikv] not(isnull(test.t1.a)), not(isnull(test.t1.b))
|
|
└─TableFullScan_11 10000.00 cop[tikv] table:t1 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 estRows task access object operator info
|
|
Projection_7 10000.00 root minus(Column#5, test.t.x)->Column#7
|
|
└─Window_8 10000.00 root row_number()->Column#5 over(partition by test.t.i)
|
|
└─Sort_11 10000.00 root test.t.i:asc
|
|
└─TableReader_10 10000.00 root data:TableRangeScan_9
|
|
└─TableRangeScan_9 10000.00 cop[tikv] table:t range:[0,+inf], keep order:false, stats:pseudo
|
|
|