1
1
create table t1 (a int not null, b int, primary key (a));
2
2
insert into t1 values (1,1);
4
4
create table if not exists t1 select 2;
8
8
create table t1 select 1,2,3;
10
10
create table if not exists t1 select 1,2;
12
12
create table if not exists t1 select 1;