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create table t1(a bit(1), b int auto_increment ,id int, index(a,b)); insert into t1 values(1,null,1); insert into t1 values(1,null,2); insert into t1 values(0,null,3); insert into t1 values(0,null,4); select a+0, b as auto_increment , id from t1 order by id; drop table t1; create table t1(a int auto_increment, b bit(5) ,id int, index (b,a)); insert into t1 values(null,b'1',1); insert into t1 values(null,b'1',2); insert into t1 values(null,b'11',3); insert into t1 values(null,b'11',4); select a as auto_increment, b+0, id from t1 order by id; drop table t1; create table t1(a bit(1), b int auto_increment , c bit(1) , d bit(1), id int,index(a,c,b,d)); insert into t1 values(1,null,1,1,1); insert into t1 values(1,null,1,1,2); insert into t1 values(0,null,1,1,3); insert into t1 values(1,null,0,1,4); select a+0, b as auto_increment, c+0, d+0, id from t1 order by id; drop table t1; CREATE TABLE t1 (b BIT(1), pk INTEGER AUTO_INCREMENT PRIMARY KEY); ALTER TABLE t1 ADD INDEX(b,pk); INSERT INTO t1 VALUES (1,b'1'); ALTER TABLE t1 DROP PRIMARY KEY; select b+0, pk as auto_increment from t1; DROP TABLE t1;