执行的sql语句:(select id,title,title_color,nav,attr,sort,is_bold,is_forward,clicks,is_fenye,is_commend,is_online,posttime,nav from web_article where id in()  order by sort desc) union (select id,title,title_color,nav,attr,sort,is_bold,is_forward,clicks,is_fenye,is_commend,is_online,posttime,nav from web_article_201405 where id in() order by sort desc) order by sort desc <br/>错误提示:SQLSTATE[42000]: Syntax error or access violation: 1064 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 ')  order by sort desc) union (select id,title,title_color,nav,attr,sort,is_bold,' at line 1