drop table if exists t1;
create table t1 (a int primary key, b int not null);
insert into t1 () values ();
insert into t1 values (1,1),(2,1),(3,1);
update t1 set a=4 where b=1 limit 1;
select * from t1;
a	b
0	0
4	1
2	1
3	1
update t1 set b=2 where b=1 limit 2;
select * from t1;
a	b
0	0
4	2
2	2
3	1
update t1 set b=4 where b=1;
select * from t1;
a	b
0	0
4	2
2	2
3	4
delete from t1 where b=2 limit 1;
select * from t1;
a	b
0	0
2	2
3	4
delete from t1 limit 1;
select * from t1;
a	b
2	2
3	4
drop table t1;
create table t1 (i int);
insert into t1 (i) values(1);
insert into t1 (i) values(1);
insert into t1 (i) values(1);
delete from t1 limit 1;
update t1 set i=2 limit 1;
delete from t1 limit 0;
update t1 set i=3 limit 0;
select * from t1;
i
2
1
drop table t1;