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use test;
drop table if exists t;
create temporary table t (
i int,
f float,
primary key pk_index(i),
index sec_index(f)
) engine = innodb;
insert into t values (10, 2.2), (20, 3.3), (30, 4.4), (40, 5.5);
rollback;
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
update t set i = 50 where i = 40;
update t set i = 60 where i = 30;
rollback;
select * from t;
i f
10 2.2
20 3.3
50 5.5
60 4.4
delete from t where i = 10;
delete from t where f < 3.4;
rollback;
select * from t;
i f
50 5.5
60 4.4
delete from t where i = 10;
delete from t;
select * from t;
i f
drop table if exists t;
create temporary table t (
i int,
f float,
primary key pk_index(i),
index sec_index(f)
) engine = innodb;
begin;
insert into t values (10, 2.2), (20, 3.3), (30, 4.4), (40, 5.5);
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
commit;
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
rollback;
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
drop table if exists t;
create temporary table t (
i int,
f float,
primary key pk_index(i),
index sec_index(f)
) engine = innodb;
begin;
insert into t values (10, 2.2), (20, 3.3), (30, 4.4), (40, 5.5);
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
rollback;
select * from t;
i f
insert into t values (10, 2.2), (20, 3.3), (30, 4.4), (40, 5.5);
begin;
delete from t;
select * from t;
i f
rollback;
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
begin;
update t set i = 50 where i = 40;
update t set i = 60 where i = 30;
select * from t;
i f
10 2.2
20 3.3
50 5.5
60 4.4
rollback;
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
drop table if exists t;
create temporary table t (
i int,
f float,
primary key pk_index(i),
index sec_index(f)
) engine = innodb;
start transaction;
savepoint first;
insert into t values (10, 2.2), (20, 3.3), (30, 4.4), (40, 5.5);
select * from t;
i f
10 2.2
20 3.3
30 4.4
40 5.5
rollback to first;
select * from t;
i f
insert into t values (10, 2.2), (20, 3.3), (30, 4.4), (40, 5.5);
begin;
delete from t where i = 10;
select * from t;
i f
20 3.3
30 4.4
40 5.5
savepoint first;
delete from t;
select * from t;
i f
rollback to first;
select * from t;
i f
20 3.3
30 4.4
40 5.5
commit;
select * from t;
i f
20 3.3
30 4.4
40 5.5
begin;
update t set i = 50 where i = 40;
savepoint first;
update t set i = 60 where i = 30;
select * from t;
i f
20 3.3
50 5.5
60 4.4
rollback to first;
select * from t;
i f
20 3.3
30 4.4
50 5.5
commit;
drop table if exists t;
use test;
create temporary table t1 (i int, f float,
primary key pk(i),
unique index fk(f)
) engine = innodb;
insert into t1 values (1, 1.2), (2, 2.3), (3, 3.4);
select * from t1;
i f
1 1.2
2 2.3
3 3.4
insert into t1 values (4, 4.5), (1, 5.6);
ERROR 23000: Duplicate entry '1' for key 't1.PRIMARY'
select * from t1;
i f
1 1.2
2 2.3
3 3.4
insert into t1 values (4, 4.5), (5, 5.6);
select * from t1;
i f
1 1.2
2 2.3
3 3.4
4 4.5
5 5.6
update t1 set i = 1 where i = 4;
ERROR 23000: Duplicate entry '1' for key 't1.PRIMARY'
truncate table t1;
insert into t1 values (1, 1.2), (3, 2.3), (5, 3.4), (6, 7.4);
select * from t1;
i f
1 1.2
3 2.3
5 3.4
6 7.4
update t1 set i = i + 1;
ERROR 23000: Duplicate entry '6' for key 't1.PRIMARY'
select * from t1;
i f
1 1.2
3 2.3
5 3.4
6 7.4
drop table t1;
|
