Question

I have many ClientIDs to many pageids

Eg.

ClientID 1 PageID 3
ClientID 1 PageID 2
ClientID 2 PageID 3
ClientID 3 PageID 3

In a query I want to bring up the record with only PageID 3 exclusively.

So in my result i should get Client 2 and 3 and client 1 should be omitted out of the results… Whats the best way to do this?

Answer 1

Try this one –

SELECT clientid FROM
  clients
GROUP BY
  clientid
HAVING
  COUNT(*) = COUNT(IF(PageID = 3, PageID, NULL));