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

Best solution is to add count of two query results. It will not be a problem if the table contains large number of records. And you don't need to use union query. Ex:

SELECT (select COUNT(distinct profile_id) from userprofile_...) + 
(select COUNT(distinct profile_id) from productions_...) AS total