删除重复我做的几个表,我有一些基本的SQL,利用工会(无论正确与否)从SQL UNION
,但我需要删除重复。有任何想法吗?
select * from calls
left join users a on calls.assigned_to= a.user_id
where a.dept = 4
union
select * from calls
left join users r on calls.requestor_id= r.user_id
where r.dept = 4
你是说你的查询不删除重复? – Yada 2010-11-08 20:33:15