create table t1 (a date); insert t1 values ('2000-01-02'), ('2001-02-03'), ('2002-03-04'); set debug_dbug='d,str_to_datetime_warn'; select * from t1 where a > date_add('2000-01-01', interval 5 day); a 2001-02-03 2002-03-04 Warnings: Note 1003 2000-01-01 set debug_dbug=''; drop table t1; create table t1 (id int not null, ut timestamp(6) not null); insert into t1 values(1, '2001-01-01 00:00:00.2'); insert into t1 values(1, '2001-01-01 00:00:00.1'); select * from t1; id ut 1 2001-01-01 00:00:00.200000 1 2001-01-01 00:00:00.100000 select (select max(m2.ut) from t1 m2 where m1.id <> 0) from t1 m1; (select max(m2.ut) from t1 m2 where m1.id <> 0) 2001-01-01 00:00:00.200000 2001-01-01 00:00:00.200000 drop table t1;