1create table t1(a bit(1), b int auto_increment ,id int, index(a,b)); 2insert into t1 values(1,null,1); 3insert into t1 values(1,null,2); 4insert into t1 values(0,null,3); 5insert into t1 values(0,null,4); 6select a+0, b as auto_increment , id from t1 order by id; 7drop table t1; 8create table t1(a int auto_increment, b bit(5) ,id int, index (b,a)); 9insert into t1 values(null,b'1',1); 10insert into t1 values(null,b'1',2); 11insert into t1 values(null,b'11',3); 12insert into t1 values(null,b'11',4); 13select a as auto_increment, b+0, id from t1 order by id; 14drop table t1; 15create table t1(a bit(1), b int auto_increment , c bit(1) , d bit(1), id int,index(a,c,b,d)); 16insert into t1 values(1,null,1,1,1); 17insert into t1 values(1,null,1,1,2); 18insert into t1 values(0,null,1,1,3); 19insert into t1 values(1,null,0,1,4); 20select a+0, b as auto_increment, c+0, d+0, id from t1 order by id; 21drop table t1; 22CREATE TABLE t1 (b BIT(1), pk INTEGER AUTO_INCREMENT PRIMARY KEY); 23ALTER TABLE t1 ADD INDEX(b,pk); 24INSERT INTO t1 VALUES (1,b'1'); 25ALTER TABLE t1 DROP PRIMARY KEY; 26select b+0, pk as auto_increment from t1; 27DROP TABLE t1; 28