drop table if exists t;
create table t(a bigint, b bigint as (a+1));
begin;
insert into t(a) values(1);
update t set b=6 where b=2;
Error 3105 (HY000): The value specified for generated column 'b' in table 't' is not allowed.
commit;
select * from t;
a	b
1	2
drop table if exists t1, t2, t3;
create table t1(id int primary key auto_increment, n int);
create table t2(id int primary key, n float auto_increment, key I_n(n));
create table t3(id int primary key, n double auto_increment, key I_n(n));
insert into t1 set n = 1;
select * from t1 where id = 1;
id	n
1	1
update t1 set id = id+1;
select * from t1 where id = 2;
id	n
2	1
insert into t1 set n = 2;
select * from t1 where id = 3;
id	n
3	2
update t1 set id = id + '1.1' where id = 3;
select * from t1 where id = 4;
id	n
4	2
insert into t1 set n = 3;
select * from t1 where id = 5;
id	n
5	3
update t1 set id = id + '0.5' where id = 5;
select * from t1 where id = 6;
id	n
6	3
insert into t1 set n = 4;
select * from t1 where id = 7;
id	n
7	4
insert into t2 set id = 1;
select * from t2 where id = 1;
id	n
1	1
update t2 set n = n+1;
select * from t2 where id = 1;
id	n
1	2
insert into t2 set id = 2;
select * from t2 where id = 2;
id	n
2	3
update t2 set n = n + '2.2';
select * from t2 where id = 2;
id	n
2	5.2
insert into t2 set id = 3;
select * from t2 where id = 3;
id	n
3	6
update t2 set n = n + '0.5' where id = 3;
select * from t2 where id = 3;
id	n
3	6.5
insert into t2 set id = 4;
select * from t2 where id = 4;
id	n
4	7
insert into t3 set id = 1;
select * from t3 where id = 1;
id	n
1	1
update t3 set n = n+1;
select * from t3 where id = 1;
id	n
1	2
insert into t3 set id = 2;
select * from t3 where id = 2;
id	n
2	3
update t3 set n = n + '3.3';
select * from t3 where id = 2;
id	n
2	6.3
insert into t3 set id = 3;
select * from t3 where id = 3;
id	n
3	7
update t3 set n = n + '0.5' where id = 3;
select * from t3 where id = 3;
id	n
3	7.5
insert into t3 set id = 4;
select * from t3 where id = 4;
id	n
4	8
drop table if exists t;
drop database if exists test2;
create database test2;
create table t(a int, b int generated always  as (a+1) virtual);
create table test2.t(a int, b int generated always  as (a+1) virtual);
update t, test2.t set executor__update.t.a=1;
drop database test2;
drop table if exists t1, t2;
create table t1 (c_str varchar(40));
create table t2 (c_str varchar(40));
insert into t1 values ('Alice');
insert into t2 values ('Bob');
select t1.c_str, t2.c_str from t1, t2 where t1.c_str <= t2.c_str;
c_str	c_str
Alice	Bob
update t1, t2 set t1.c_str = t2.c_str, t2.c_str = t1.c_str where t1.c_str <= t2.c_str;
select t1.c_str, t2.c_str from t1, t2 where t1.c_str <= t2.c_str;
c_str	c_str
drop table if exists t;
create table t (a int, b int);
insert into t values(1, 2);
select * from t;
a	b
1	2
update t set a=b, b=a;
select * from t;
a	b
2	1
drop table if exists t;
create table t (a int, b int);
insert into t values (1,3);
select * from t;
a	b
1	3
update t set a=b, b=a;
select * from t;
a	b
3	1
drop table if exists t;
create table t (a int, b int, c int as (-a) virtual, d int as (-b) stored);
insert into t(a, b) values (10, 11), (20, 22);
select * from t;
a	b	c	d
10	11	-10	-11
20	22	-20	-22
update t set a=b, b=a;
select * from t;
a	b	c	d
11	10	-11	-10
22	20	-22	-20
update t set b=30, a=b;
select * from t;
a	b	c	d
10	30	-10	-30
20	30	-20	-30
drop table if exists t;
create table t(x int, y int);
insert into t values();
update t t1, t t2 set t2.y=1, t1.x=2;
select * from t;
x	y
2	1
update t t1, t t2 set t1.x=t2.y, t2.y=t1.x;
select * from t;
x	y
1	2
drop table if exists t;
create table t(x int, y int, z int as (x+10) stored, w int as (y-10) virtual);
insert into t(x, y) values(1, 2), (3, 4);
update t t1, t t2 set t2.y=1, t1.x=2 where t1.x=1;
select * from t;
x	y	z	w
2	1	12	-9
3	1	13	-9
update t t1, t t2 set t1.x=5, t2.y=t1.x where t1.x=3;
select * from t;
x	y	z	w
2	3	12	-7
5	3	15	-7
drop table if exists t;
create table t(a int, b int, c int as (a+b) stored);
insert into t(a, b) values (1, 2);
update t t1, t t2 set t2.a=3;
select * from t;
a	b	c
3	2	5
update t t1, t t2 set t1.a=4, t2.b=5;
select * from t;
a	b	c
4	5	9
drop table if exists t;
create table t (a int primary key);
insert into t values (1), (2);
update t set a=a+2;
select * from t;
a
3
4
update t m, t n set m.a = n.a+10 where m.a=n.a;
select * from t;
a
13
14
drop table if exists t;
create table t (a int primary key, b int);
insert into t values (1,3), (2,4);
update t m, t n set m.a = n.a+10, n.b = m.b+1 where m.a=n.a;
Error 1706 (HY000): Primary key/partition key update is not allowed since the table is updated both as 'm' and 'n'.
drop table if exists t;
create table t (a int, b int, c int, primary key(a, b));
insert into t values (1,3,5), (2,4,6);
update t m, t n set m.a = n.a+10, m.b = n.b+10 where m.a=n.a;
select * from t;
a	b	c
11	13	5
12	14	6
update t m, t n, t q set q.c=m.a+n.b, n.c = m.a+1, m.c = n.b+1 where m.b=n.b AND m.a=q.a;
select * from t;
a	b	c
11	13	24
12	14	26
update t m, t n, t q set m.a = m.a+1, n.c = n.c-1, q.c = q.a+q.b where m.b=n.b and n.b=q.b;
Error 1706 (HY000): Primary key/partition key update is not allowed since the table is updated both as 'm' and 'n'.
set tidb_enable_clustered_index = on;
drop table if exists t;
create table t(id varchar(200) primary key, v int);
insert into t(id, v) values ('abc', 233);
select id, v from t where id = 'abc';
id	v
abc	233
update t set id = 'dfg' where id = 'abc';
select * from t;
id	v
dfg	233
update t set id = 'aaa', v = 333 where id = 'dfg';
select * from t where id = 'aaa';
id	v
aaa	333
update t set v = 222 where id = 'aaa';
select * from t where id = 'aaa';
id	v
aaa	222
insert into t(id, v) values ('bbb', 111);
update t set id = 'bbb' where id = 'aaa';
Error 1062 (23000): Duplicate entry 'bbb' for key 't.PRIMARY'
drop table if exists ut3pk;
create table ut3pk(id1 varchar(200), id2 varchar(200), v int, id3 int, primary key(id1, id2, id3));
insert into ut3pk(id1, id2, v, id3) values ('aaa', 'bbb', 233, 111);
select id1, id2, id3, v from ut3pk where id1 = 'aaa' and id2 = 'bbb' and id3 = 111;
id1	id2	id3	v
aaa	bbb	111	233
update ut3pk set id1 = 'abc', id2 = 'bbb2', id3 = 222, v = 555 where id1 = 'aaa' and id2 = 'bbb' and id3 = 111;
select id1, id2, id3, v from ut3pk where id1 = 'abc' and id2 = 'bbb2' and id3 = 222;
id1	id2	id3	v
abc	bbb2	222	555
select id1, id2, id3, v from ut3pk;
id1	id2	id3	v
abc	bbb2	222	555
update ut3pk set v = 666 where id1 = 'abc' and id2 = 'bbb2' and id3 = 222;
select id1, id2, id3, v from ut3pk;
id1	id2	id3	v
abc	bbb2	222	666
insert into ut3pk(id1, id2, id3, v) values ('abc', 'bbb3', 222, 777);
update ut3pk set id2 = 'bbb3' where id1 = 'abc' and id2 = 'bbb2' and id3 = 222;
Error 1062 (23000): Duplicate entry 'abc-bbb3-222' for key 'ut3pk.PRIMARY'
drop table if exists ut1pku;
create table ut1pku(id varchar(200) primary key, uk int, v int, unique key ukk(uk));
insert into ut1pku(id, uk, v) values('a', 1, 2), ('b', 2, 3);
select * from ut1pku;
id	uk	v
a	1	2
b	2	3
update ut1pku set uk = 3 where id = 'a';
select * from ut1pku;
id	uk	v
a	3	2
b	2	3
update ut1pku set uk = 2 where id = 'a';
Error 1062 (23000): Duplicate entry '2' for key 'ut1pku.ukk'
select * from ut1pku;
id	uk	v
a	3	2
b	2	3
drop table if exists t;
create table t(a char(10) primary key, b char(10));
insert into t values('a', 'b');
update t set a='c' where t.a='a' and b='b';
select * from t;
a	b
c	b
drop table if exists s;
create table s (a int, b int, c int, primary key (a, b));
insert s values (3, 3, 3), (5, 5, 5);
update s set c = 10 where a = 3;
select * from s;
a	b	c
3	3	10
5	5	5
set tidb_enable_clustered_index = default;
set tidb_enable_clustered_index = on;
drop table if exists t;
create table t(id varchar(200) primary key, v int);
insert into t(id, v) values ('abc', 233);
delete from t where id = 'abc';
select * from t;
id	v
select * from t where id = 'abc';
id	v
drop table if exists it3pk;
create table it3pk(id1 varchar(200), id2 varchar(200), v int, id3 int, primary key(id1, id2, id3));
insert into it3pk(id1, id2, v, id3) values ('aaa', 'bbb', 233, 111);
delete from it3pk where id1 = 'aaa' and id2 = 'bbb' and id3 = 111;
select * from it3pk;
id1	id2	v	id3
select * from it3pk where id1 = 'aaa' and id2 = 'bbb' and id3 = 111;
id1	id2	v	id3
insert into it3pk(id1, id2, v, id3) values ('aaa', 'bbb', 433, 111);
select * from it3pk where id1 = 'aaa' and id2 = 'bbb' and id3 = 111;
id1	id2	v	id3
aaa	bbb	433	111
drop table if exists dt3pku;
create table dt3pku(id varchar(200) primary key, uk int, v int, unique key uuk(uk));
insert into dt3pku(id, uk, v) values('a', 1, 2);
delete from dt3pku where id = 'a';
select * from dt3pku;
id	uk	v
insert into dt3pku(id, uk, v) values('a', 1, 2);
drop table if exists s1;
create table s1 (a int, b int, c int, primary key (a, b));
insert s1 values (3, 3, 3), (5, 5, 5);
delete from s1 where a = 3;
select * from s1;
a	b	c
5	5	5
set tidb_enable_clustered_index = default;
set tidb_enable_clustered_index = on;
drop table if exists rt1pk;
create table rt1pk(id varchar(200) primary key, v int);
replace into rt1pk(id, v) values('abc', 1);
select * from rt1pk;
id	v
abc	1
replace into rt1pk(id, v) values('bbb', 233), ('abc', 2);
select * from rt1pk;
id	v
abc	2
bbb	233
drop table if exists rt3pk;
create table rt3pk(id1 timestamp, id2 time, v int, id3 year, primary key(id1, id2, id3));
replace into rt3pk(id1, id2,id3, v) values('2018-01-01 11:11:11', '22:22:22', '2019', 1);
select * from rt3pk;
id1	id2	v	id3
2018-01-01 11:11:11	22:22:22	1	2019
replace into rt3pk(id1, id2, id3, v) values('2018-01-01 11:11:11', '22:22:22', '2019', 2);
select * from rt3pk;
id1	id2	v	id3
2018-01-01 11:11:11	22:22:22	2	2019
drop table if exists rt1pk1u;
create table rt1pk1u(id varchar(200) primary key, uk int, v int, unique key uuk(uk));
replace into rt1pk1u(id, uk, v) values("abc", 2, 1);
select * from rt1pk1u;
id	uk	v
abc	2	1
replace into rt1pk1u(id, uk, v) values("aaa", 2, 11);
select * from rt1pk1u;
id	uk	v
aaa	2	11
set tidb_enable_clustered_index = default;
drop table if exists t;
create table t(ts int(10) unsigned NULL DEFAULT NULL);
insert into t values(1);
update t set ts = IF(ts < (0 - ts), 1,1) where ts>0;
Error 1690 (22003): BIGINT UNSIGNED value is out of range in '(0 - executor__update.t.ts)'
drop table if exists tt;
create table tt (m0 varchar(64), status tinyint not null);
insert into tt values('1',0),('1',0),('1',0);
update tt a inner join (select m0 from tt where status!=1 group by m0 having count(*)>1) b on a.m0=b.m0 set a.status=1;
drop table if exists t1;
create table t1(id int, a int unsigned);
set sql_mode='';
insert into t1 values(1, 10), (2, 20);
update t1 set a='-1' where id=1;
update t1 set a='1000000000000000000' where id=2;
select id, a from t1 order by id asc;
id	a
1	0
2	4294967295
set sql_mode=default;
drop table if exists t1;
create table t1(id int primary key, name varchar(40));
insert into t1 values(1, 'abc');
begin pessimistic;
begin pessimistic;
update t1 set name='xyz' where id=1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
select * from t1 where id = 1;
id	name
1	xyz
commit;
update t1 set name='xyz' where id=1;
affected rows: 0
info: Rows matched: 1  Changed: 0  Warnings: 0
select * from t1 where id = 1;
id	name
1	abc
select * from t1 where id = 1 for update;
id	name
1	xyz
select * from t1 where id in (1, 2);
id	name
1	abc
select * from t1 where id in (1, 2) for update;
id	name
1	xyz
commit;
drop table if exists update_test;
create table update_test(id int not null default 1, name varchar(255), PRIMARY KEY(id));
insert INTO update_test VALUES (1, "hello");
insert into update_test values (2, "hello");
UPDATE update_test SET name = "abc" where id > 0;
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
begin;
SELECT * from update_test limit 2;
id	name
1	abc
2	abc
commit;
UPDATE update_test SET name = "foo";
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
begin;
drop table if exists update_test;
commit;
begin;
create table update_test(id int not null auto_increment, name varchar(255), primary key(id));
insert into update_test(name) values ('aa');
update update_test set id = 8 where name = 'aa';
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
insert into update_test(name) values ('bb');
commit;
begin;
select * from update_test;
id	name
8	aa
9	bb
commit;
begin;
drop table if exists update_test;
commit;
begin;
create table update_test(id int not null auto_increment, name varchar(255), index(id));
insert into update_test(name) values ('aa');
update update_test set id = null where name = 'aa';
Error 1048 (23000): Column 'id' cannot be null
drop table update_test;
create table update_test(id int);
begin;
insert into update_test(id) values (1);
update update_test set id = 2 where id = 1 limit 1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
select * from update_test;
id
2
commit;
drop table if exists update_unique;
create table update_unique (id int primary key, name int unique);
insert update_unique values (1, 1), (2, 2);
begin;
update update_unique set name = 1 where id = 2;
Error 1062 (23000): Duplicate entry '1' for key 'update_unique.name'
commit;
select * from update_unique;
id	name
1	1
2	2
drop table if exists t;
create table t(a bigint, primary key (a));
insert into t values (1);
insert into t values (2);
update ignore t set a = 1 where a = 2;
affected rows: 0
info: Rows matched: 1  Changed: 0  Warnings: 1
SHOW WARNINGS;
Level	Code	Message
Warning	1062	Duplicate entry '1' for key 't.PRIMARY'
select * from t;
a
1
2
update ignore t set a = 1 where a = (select '2a');
SHOW WARNINGS;
Level	Code	Message
Warning	1292	Truncated incorrect DOUBLE value: '2a'
Warning	1292	Truncated incorrect DOUBLE value: '2a'
Warning	1062	Duplicate entry '1' for key 't.PRIMARY'
update ignore t set a = 42 where a = 2;
select * from t;
a
1
42
drop table if exists t;
create table t(a bigint, unique key I_uniq (a));
insert into t values (1);
insert into t values (2);
update ignore t set a = 1 where a = 2;
affected rows: 0
info: Rows matched: 1  Changed: 0  Warnings: 1
SHOW WARNINGS;
Level	Code	Message
Warning	1062	Duplicate entry '1' for key 't.I_uniq'
select * from t;
a
1
2
drop table if exists t;
create table t (a int) partition by list (a) (partition p0 values in (0,1));
analyze table t;
insert ignore into t values (1);
update ignore t set a=2 where a=1;
affected rows: 0
info: Rows matched: 1  Changed: 0  Warnings: 1
drop table if exists t;
create table t (a int key) partition by list (a) (partition p0 values in (0,1));
insert ignore into t values (1);
update ignore t set a=2 where a=1;
affected rows: 0
info: Rows matched: 1  Changed: 0  Warnings: 1
drop table if exists t;
create table t(id integer auto_increment, t1 datetime, t2 datetime, primary key (id));
insert into t(t1, t2) values('2000-10-01 01:01:01', '2017-01-01 10:10:10');
select * from t;
id	t1	t2
1	2000-10-01 01:01:01	2017-01-01 10:10:10
update t set t1 = '2017-10-01 10:10:11', t2 = date_add(t1, INTERVAL 10 MINUTE) where id = 1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
select * from t;
id	t1	t2
1	2017-10-01 10:10:11	2000-10-01 01:11:01
drop table if exists tt1;
CREATE TABLE `tt1` (`a` int(11) NOT NULL,`b` varchar(32) DEFAULT NULL,`c` varchar(32) DEFAULT NULL,PRIMARY KEY (`a`),UNIQUE KEY `b_idx` (`b`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
insert into tt1 values(1, 'a', 'a');
insert into tt1 values(2, 'd', 'b');
select * from tt1;
a	b	c
1	a	a
2	d	b
update tt1 set a=5 where c='b';
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
select * from tt1;
a	b	c
1	a	a
5	d	b
drop table if exists tsup;
CREATE TABLE `tsup` (`a` int,`ts` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,KEY `idx` (`ts`));
set @@sql_mode='';
insert into tsup values(1, '0000-00-00 00:00:00');
update tsup set a=5;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
select t1.ts = t2.ts from (select ts from tsup use index (idx)) as t1, (select ts from tsup use index ()) as t2;
t1.ts = t2.ts
1
update tsup set ts='2019-01-01';
select ts from tsup;
ts
2019-01-01 00:00:00
set @@sql_mode=default;
drop table if exists decimals;
create table decimals (a decimal(20, 0) not null);
insert into decimals values (201);
update decimals set a = a + 1.23;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 1
show warnings;
Level	Code	Message
Warning	1292	Truncated incorrect DECIMAL value: '202.23'
select * from decimals;
a
202
drop table t;
CREATE TABLE `t` (	`c1` year DEFAULT NULL, `c2` year DEFAULT NULL, `c3` date DEFAULT NULL, `c4` datetime DEFAULT NULL,	KEY `idx` (`c1`,`c2`));
UPDATE t SET c2=16777215 WHERE c1>= -8388608 AND c1 < -9 ORDER BY c1 LIMIT 2;
update (select * from t) t set c1 = 1111111;
Error 1288 (HY000): The target table t of the UPDATE is not updatable
drop table if exists t;
create table t (i int not null default 10);
insert into t values (1);
update ignore t set i = null;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 1
SHOW WARNINGS;
Level	Code	Message
Warning	1048	Column 'i' cannot be null
select * from t;
i
0
drop table t;
create table t (k int, v int);
update t, (select * from t) as b set b.k = t.k;
Error 1288 (HY000): The target table b of the UPDATE is not updatable
update t, (select * from t) as b set t.k = b.k;
drop table if exists t1;
CREATE TABLE t1 (c1 float);
INSERT INTO t1 SET c1 = 1;
UPDATE t1 SET c1 = 1.2 WHERE c1=1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
drop table if exists t;
create table t (c1 float(1,1));
insert into t values (0.0);
update t set c1 = 2.0;
Error 1264 (22003): Out of range value for column 'c1' at row 1
drop table if exists t;
create table t(a datetime not null, b datetime);
insert into t value('1999-12-12', '1999-12-13');
set @@sql_mode='';
select * from t;
a	b
1999-12-12 00:00:00	1999-12-13 00:00:00
update t set a = '';
select * from t;
a	b
0000-00-00 00:00:00	1999-12-13 00:00:00
update t set b = '';
select * from t;
a	b
0000-00-00 00:00:00	0000-00-00 00:00:00
set @@sql_mode=default;
drop view if exists v;
create view v as select * from t;
update v set a = '2000-11-11';
Error 1288 (HY000): The target table v of the UPDATE is not updatable
drop view v;
drop sequence if exists seq;
create sequence seq;
update seq set minvalue=1;
Error 1054 (42S22): Unknown column 'minvalue' in 'field list'
drop sequence seq;
drop table if exists t1, t2;
create table t1(a int, b int, c int, d int, e int, index idx(a));
create table t2(a int, b int, c int);
update t1 join t2 on t1.a=t2.a set t1.a=1 where t2.b=1 and t2.c=2;
drop table if exists t1, t2;
create table t1 (a int default 1, b int default 2);
insert into t1 values (10, 10), (20, 20);
update t1 set a=default where b=10;
select * from t1;
a	b
1	10
20	20
update t1 set a=30, b=default where a=20;
select * from t1;
a	b
1	10
30	2
update t1 set a=default, b=default where a=30;
select * from t1;
a	b
1	10
1	2
insert into t1 values (40, 40);
update t1 set a=default, b=default;
select * from t1;
a	b
1	2
1	2
1	2
update t1 set a=default(b), b=default(a);
select * from t1;
a	b
2	1
2	1
2	1
create table t2 (a int default 1, b int generated always as (-a) virtual, c int generated always as (-a) stored);
insert into t2 values (10, default, default), (20, default, default);
update t2 set b=default;
select * from t2;
a	b	c
10	-10	-10
20	-20	-20
update t2 set a=30, b=default where a=10;
select * from t2;
a	b	c
30	-30	-30
20	-20	-20
update t2 set c=default, a=40 where c=-20;
select * from t2;
a	b	c
30	-30	-30
40	-40	-40
update t2 set a=default, b=default, c=default where b=-30;
select * from t2;
a	b	c
1	-1	-1
40	-40	-40
update t2 set a=default(a), b=default, c=default;
select * from t2;
a	b	c
1	-1	-1
1	-1	-1
update t2 set a=default(b), b=default, c=default;
select * from t2;
a	b	c
NULL	NULL	NULL
NULL	NULL	NULL
update t2 set b=default(a);
Error 3105 (HY000): The value specified for generated column 'b' in table 't2' is not allowed.
update t2 set a=default(a), c=default(c);
select * from t2;
a	b	c
1	-1	-1
1	-1	-1
update t2 set a=default(b), b=default(b);
select * from t2;
a	b	c
NULL	NULL	NULL
NULL	NULL	NULL
update t2 set a=default(a), c=default(c);
select * from t2;
a	b	c
1	-1	-1
1	-1	-1
update t2 set a=default(a), c=default(a);
Error 3105 (HY000): The value specified for generated column 'c' in table 't2' is not allowed.
drop table t1, t2;
drop table if exists msg, detail;
create table msg (id varchar(8), b int, status int, primary key (id, b));
insert msg values ('abc', 1, 1);
create table detail (id varchar(8), start varchar(8), status int, index idx_start(start));
insert detail values ('abc', '123', 2);
UPDATE msg SET msg.status = (SELECT detail.status FROM detail WHERE msg.id = detail.id);
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
admin check table msg;
drop table if exists ttt;
CREATE TABLE ttt (id bigint(20) NOT NULL, host varchar(30) NOT NULL, PRIMARY KEY (id), UNIQUE KEY i_host (host));
insert into ttt values (8,8),(9,9);
begin;
update ttt set id = 0, host='9' where id = 9 limit 1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
delete from ttt where id = 0 limit 1;
select * from ttt use index (i_host) order by host;
id	host
8	8
update ttt set id = 0, host='8' where id = 8 limit 1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
delete from ttt where id = 0 limit 1;
select * from ttt use index (i_host) order by host;
id	host
commit;
admin check table ttt;
drop table ttt;
drop table if exists a;
create table a(id int auto_increment, a int default null, primary key(id));
insert into a values (1, 1001), (2, 1001), (10001, 1), (3, 1);
update a set id = id*10 where a = 1001;
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
drop table a;
create table a ( a bigint, b bigint);
insert into a values (1, 1001), (2, 1001), (10001, 1), (3, 1);
update a set a = a*10 where b = 1001;
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
drop table if exists items, month;
CREATE TABLE items (id int, price TEXT);
insert into items values (11, "items_price_11"), (12, "items_price_12"), (13, "items_price_13");
affected rows: 3
info: Records: 3  Duplicates: 0  Warnings: 0
CREATE TABLE month (mid int, mprice TEXT);
insert into month values (11, "month_price_11"), (22, "month_price_22"), (13, "month_price_13");
affected rows: 3
info: Records: 3  Duplicates: 0  Warnings: 0
UPDATE items, month  SET items.price=month.mprice WHERE items.id=month.mid;
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
begin;
SELECT * FROM items;
id	price
11	month_price_11
12	items_price_12
13	month_price_13
commit;
UPDATE items join month on items.id=month.mid SET items.price=month.mid;
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
begin;
SELECT * FROM items;
id	price
11	11
12	items_price_12
13	13
commit;
UPDATE items T0 join month T1 on T0.id=T1.mid SET T0.price=T1.mprice;
affected rows: 2
info: Rows matched: 2  Changed: 2  Warnings: 0
begin;
SELECT * FROM items;
id	price
11	month_price_11
12	items_price_12
13	month_price_13
commit;
DROP TABLE IF EXISTS t1, t2;
create table t1 (c int);
create table t2 (c varchar(256));
insert into t1 values (1), (2);
insert into t2 values ("a"), ("b");
update t1, t2 set t1.c = 10, t2.c = "abc";
affected rows: 4
info: Rows matched: 4  Changed: 4  Warnings: 0
DROP TABLE IF EXISTS t1, t2;
create table t1 (c1 int);
create table t2 (c2 int);
insert into t1 values (1), (2);
insert into t2 values (1), (2);
update t1, t2 set t1.c1 = 10, t2.c2 = 2 where t2.c2 = 1;
affected rows: 3
info: Rows matched: 3  Changed: 3  Warnings: 0
select * from t1;
c1
10
10
drop table if exists t;
create table t (a int, b int);
insert into t values(1, 1), (2, 2), (3, 3);
affected rows: 3
info: Records: 3  Duplicates: 0  Warnings: 0
update t m, t n set m.a = m.a + 1;
affected rows: 3
info: Rows matched: 3  Changed: 3  Warnings: 0
select * from t;
a	b
2	1
3	2
4	3
update t m, t n set n.a = n.a - 1, n.b = n.b + 1;
affected rows: 3
info: Rows matched: 3  Changed: 3  Warnings: 0
select * from t;
a	b
1	2
2	3
3	4
drop table if exists update_modified;
create table update_modified (col_1 int, col_2 enum('a', 'b'));
set SQL_MODE='';
insert into update_modified values (0, 3);
SELECT * FROM update_modified;
col_1	col_2
0	
set SQL_MODE=STRICT_ALL_TABLES;
update update_modified set col_1 = 1;
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
SELECT * FROM update_modified;
col_1	col_2
1	
update update_modified set col_1 = 2, col_2 = 'c';
Error 1265 (01000): Data truncated for column '%s' at row %d
SELECT * FROM update_modified;
col_1	col_2
1	
update update_modified set col_1 = 3, col_2 = 'a';
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
SELECT * FROM update_modified;
col_1	col_2
3	a
drop table if exists update_with_diff_type;
CREATE TABLE update_with_diff_type (a int, b JSON);
INSERT INTO update_with_diff_type VALUES(3, '{"a": "测试"}');
UPDATE update_with_diff_type SET a = '300';
affected rows: 1
info: Rows matched: 1  Changed: 1  Warnings: 0
SELECT a FROM update_with_diff_type;
a
300
UPDATE update_with_diff_type SET b = '{"a":   "\\u6d4b\\u8bd5"}';
affected rows: 0
info: Rows matched: 1  Changed: 0  Warnings: 0
SELECT b FROM update_with_diff_type;
b
{"a": "测试"}
set SQL_MODE=default;
drop table if exists parent, child;
create table parent (id int primary key, ref int, key(ref));
create table child (id int primary key, ref int, foreign key (ref) references parent(ref));
insert into parent values (1, 1), (2, 2);
insert into child values (1, 1);
update child set ref = 2 where id = 1;
update child set ref = 3 where id = 1;
Error 1452 (23000): Cannot add or update a child row: a foreign key constraint fails (`executor__update`.`child`, CONSTRAINT `fk_1` FOREIGN KEY (`ref`) REFERENCES `parent` (`ref`))
update ignore child set ref = 3 where id = 1;
Level	Code	Message
Warning	1452	Cannot add or update a child row: a foreign key constraint fails (`executor__update`.`child`, CONSTRAINT `fk_1` FOREIGN KEY (`ref`) REFERENCES `parent` (`ref`))
update parent set ref = 3 where id = 2;
Error 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`executor__update`.`child`, CONSTRAINT `fk_1` FOREIGN KEY (`ref`) REFERENCES `parent` (`ref`))
update ignore parent set ref = 3 where id = 2;
DROP TABLE IF EXISTS t, tp;
CREATE TABLE t (a INT, b INT, dt DATE, PRIMARY KEY (a) NONCLUSTERED);
CREATE TABLE tp (a INT, b INT, dt DATE, PRIMARY KEY (a) NONCLUSTERED)
PARTITION BY RANGE (a) (
PARTITION p0 VALUES LESS THAN (5),
PARTITION p1 VALUES LESS THAN (11),
PARTITION p2 VALUES LESS THAN (20)
);
INSERT INTO tp(a,b) VALUES (2,2),(4,4),(6,6);
INSERT INTO t(a,b) VALUES (12,12),(14,14),(15,15),(16,16);
SELECT *, _tidb_rowid FROM t ORDER BY a;
a	b	dt	_tidb_rowid
12	12	NULL	1
14	14	NULL	2
15	15	NULL	3
16	16	NULL	4
SELECT *, _tidb_rowid FROM tp ORDER BY a;
a	b	dt	_tidb_rowid
2	2	NULL	1
4	4	NULL	2
6	6	NULL	3
ALTER TABLE tp EXCHANGE PARTITION p2 WITH TABLE t;
SELECT *, _tidb_rowid FROM tp ORDER BY a;
a	b	dt	_tidb_rowid
2	2	NULL	1
4	4	NULL	2
6	6	NULL	3
12	12	NULL	1
14	14	NULL	2
15	15	NULL	3
16	16	NULL	4
UPDATE tp SET dt = '2025-12-16';
SELECT *, _tidb_rowid FROM tp ORDER BY a;
a	b	dt	_tidb_rowid
2	2	2025-12-16	1
4	4	2025-12-16	2
6	6	2025-12-16	3
12	12	2025-12-16	1
14	14	2025-12-16	2
15	15	2025-12-16	3
16	16	2025-12-16	4
UPDATE tp SET b = 333;
SELECT *, _tidb_rowid FROM tp ORDER BY a;
a	b	dt	_tidb_rowid
2	333	2025-12-16	1
4	333	2025-12-16	2
6	333	2025-12-16	3
12	333	2025-12-16	1
14	333	2025-12-16	2
15	333	2025-12-16	3
16	333	2025-12-16	4
DROP TABLE t, tp;