mysql Date and Time type query

mysql Date Time query

Date query

'2018'
'2018-09'
'2018-09-01'
2018-09
2018-09-01  // sometimes also not works
09
2018
201809
20180901

如 select * from avaliable_times where course_date = 2018;


mysql> update avaliable_times set still_valid="0" where teacher_id=95 and course_date=2018-07-09 and start_time=080000;
ERROR 1292 (22007): Incorrect date value: '2002' for column 'course_date' at row 1

Time query

'08:00:00'
'08'
08
0800
080000    // strongly recomened

如select * from avaliable_times where start_time in ('09:00:00', '08:00:00');

需要注意的是：2018-08-01可以查询，而08:00:00不能查询

mysql> select * from avaliable_times where start_time in (09:00:00, 08:00:00);
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ':00:00, 08:00:00)' at line 1