How to do a count on a union query

Question

I have the following query:

select distinct profile_id from userprofile_...

union

select distinct profile_id from productions_...

How wou

Answer 1

As omg ponies has already pointed out that there is no use of using distinct with UNION, you can use UNION ALL in your case.....

SELECT COUNT(*) 
FROM 
( 
select distinct profile_id from userprofile_...
union all
select distinct profile_id from productions_...
) AS t1