remove duplicates from sql union

Question

I\'m doing some basic sql on a few tables I have, using a union(rightly or wrongly)

but I need remove the duplicates. Any ideas?

select * from calls
         


        

Answer 1

If you are using T-SQL then it appears from previous posts that UNION removes duplicates. But if you are not, you could use distinct. This doesn't quite feel right to me either but it could get you the result you are looking for

SELECT DISTINCT *
FROM
(
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
)a