select * from article where class_id in (,3,4,12,14,17,22,23,268,269,271,277,278,280,282,283) order by id desc limit 0,20You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ',3,4,12,14,17,22,23,268,269,271,277,278,280,282,283) order by i' at line 2