帝国CMS如何用一句mysql语句实现多表数据之和？

SELECT COUNT(AA.id) FROM (SELECT id FROM ecms_news UNION ALL SELECT id FROM ecms_xiazai UNION ALL SELECT id FROM ecms_photo UNION ALL SELECT id FROM ecms_download) AA;

上面语句在帝国cms后台无法使用，需要做一下修改。

SELECT COUNT(AA.id) as total FROM (SELECT id FROM ecms_news UNION ALL SELECT id FROM ecms_xiazai UNION ALL SELECT id FROM ecms_photo UNION ALL SELECT id FROM ecms_download) AA;

是不是很简单，赶紧收藏起来吧。