Question

How do I union or join or CTE two selects, so that I only get the results that exists in both

SELECT DISTINCT userid FROM ads WHERE status <> 'BASIC'

Let’s say the result set is: 1, 2, 3, 4, 5

SELECT DISTINCT userid FROM ads WHERE state = 'Alabama'

Let’s say the result set is 2, 4, 5, 8, 9

Then I want 2, 4 and 5

Answer 1

This is what INTERSECT does.

I removed DISTINCT from the queries as this is implied by INTERSECT in SQL Server (it does not implement INTERSECT ALL)

SELECT userid
FROM   ads
WHERE  status <> 'BASIC'
INTERSECT
SELECT userid
FROM   ads
WHERE  state = 'Alabama'