出错信息： MySQL Query Error
SQL: select c.* from (select a.*,b.content from `dc_content` a ,`dc_content_data` b where a.aid=b.aid)c,(select * from `dc_category` where pid=140)d where c.cid=d.cid order by c.updatetime limit -20,0
错误详情: 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 '-20,0' at line 1
错误代码:1064