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
3
create table t1 (a int not null auto_increment,b int, primary key (a)) engine=myisam auto_increment=3;
8
4
insert into t1 values (NULL,1),(NULL,2),(NULL,3);