drop table if exists t1;
create table t1 (a int not null auto_increment,b int, primary key (a)) engine=heap auto_increment=3;
insert into t1 values (1,1),(NULL,3),(NULL,4);
delete from t1 where a=4;
insert into t1 values (NULL,5),(NULL,6);
select * from t1;
a	b
1	1
3	3
5	5
6	6
delete from t1 where a=6;
replace t1 values (3,1);
ALTER TABLE t1 add c int;
replace t1 values (3,3,3);
insert into t1 values (NULL,7,7);
update t1 set a=8,b=b+1,c=c+1 where a=7;
insert into t1 values (NULL,9,9);
select * from t1;
a	b	c
1	1	NULL
3	3	3
5	5	NULL
8	8	8
9	9	9
drop table t1;
create table t1 (
skey tinyint unsigned NOT NULL auto_increment PRIMARY KEY,
sval char(20)
) engine=heap;
insert into t1 values (NULL, "hello");
insert into t1 values (NULL, "hey");
select * from t1;
skey	sval
1	hello
2	hey
select _rowid,t1._rowid,skey,sval from t1;
_rowid	_rowid	skey	sval
1	1	1	hello
2	2	2	hey
drop table t1;