根据时间戳分钟删除行

Question

How to delete rows based on timestamp in same minute. ex:

id|temp| dt
1 | 20 | 2015-10-08 06:45:04
2 | 20 | 2015-10-08 06:40:03
3 | 21 | 2015-10-08 06:35:03
4 | 20 | 2015-10-08 06:20:04

I want to delete only records in the minute 5 (ids 1 and 3) I tried delete from table where minute(dt)=5 and works partially (?)

Answer 1

Try this:

DELETE FROM mytable 
WHERE (minute(dt) - 5) % 10 = 0

This deletes all rows whose minute value ends at 5 (if this is what you really want).

Simpler version of the above query (thanks to @Gordon):

DELETE FROM mytable 
WHERE minute(dt) % 10 = 5