drop table if exists t1; create table t1 (a char(10), tmsp timestamp); insert into t1 set a = 1; insert delayed into t1 set a = 2; insert into t1 set a = 3, tmsp=NULL; insert delayed into t1 set a = 4; insert delayed into t1 set a = 5, tmsp = 19711006010203; insert delayed into t1 (a, tmsp) values (6, 19711006010203); insert delayed into t1 (a, tmsp) values (7, NULL); insert into t1 set a = 8,tmsp=19711006010203; select * from t1 where tmsp=0; a tmsp select * from t1 where tmsp=19711006010203; a tmsp 5 1971-10-06 01:02:03 6 1971-10-06 01:02:03 8 1971-10-06 01:02:03 drop table t1; create table t1 (a int not null auto_increment primary key, b char(10)); insert delayed into t1 values (1,"b"); insert delayed into t1 values (null,"c"); insert delayed into t1 values (3,"d"),(null,"e"); insert delayed into t1 values (3,"this will give an","error"); ERROR 21S01: Column count doesn't match value count at row 1 select * from t1; a b 1 b 2 c 3 d 4 e drop table t1;