2
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
5
drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
7
create table t1 (n int not null primary key);
8
insert into t1 values (1);
9
create table t2 (n int);
10
insert into t2 values (1);
11
insert ignore into t1 select * from t2;
12
insert into t1 values (2);