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
Note	1003	2000-01-06
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;