Question

I have an SQL query that looks like this:

SELECT DISTINCT UserId, PoliticianId
FROM Votes
WHERE UserId= 1010

The result looks like this:

UserId | PoliticianId
1010     3
1010     10
1010     35

Is there a way to get number of rows returned by this query?
I’ve tried with COUNT(*) but it didn’t work, probably because I’ve done the
query wrong.
I know I could just retrieve all the rows and count them on the server but I want to avoid that.

Answer 1

All these rows have the same UserId but different PoliticianId so you can use COUNT(DISTINCT column):

SELECT COUNT(DISTINCT PoliticianId) AS result
FROM Votes
WHERE UserId = 1010 ;