2
create table t1 (a int not null auto_increment,b int, primary key (a)) engine=heap auto_increment=3;
2
create temporary table t1 (a int not null auto_increment,b int, primary key (a)) engine=heap auto_increment=3;
3
3
insert into t1 values (1,1),(NULL,3),(NULL,4);
4
4
delete from t1 where a=4;
5
5
insert into t1 values (NULL,5),(NULL,6);