drop table if exists t1; set @org_mode=@@sql_mode; create table t1 ( `a` tinyint(4) NOT NULL auto_increment, primary key (`a`) ) engine = 'MEMORY' ; set @@sql_mode='strict_all_tables'; insert into t1 values(1000); ERROR 22003: Out of range value for column 'a' at row 1 select count(*) from t1; count(*) 0 set auto_increment_increment=1000; set auto_increment_offset=700; insert into t1 values(null); ERROR 22003: Out of range value for column 'a' at row 1 select count(*) from t1; count(*) 0 set @@sql_mode=@org_mode; insert into t1 values(null); ERROR 22003: Out of range value for column 'a' at row 1 select * from t1; a drop table t1;