SQL Select only rows where exact multiple relationships exist

Question

This is closely related to this question, but adds another requirement.

Given a parent table \'parent\'

╔════════════╦════════╗
║ PARENT_ID  ║ NAME           


        

Answer 1

SELECT PARENT_ID
FROM rel
GROUP BY PARENT_ID
HAVING SUM(PROP_ID NOT IN (5,1)) = 0
AND SUM(PROP_ID = 1) = 1 
AND SUM(PROP_ID = 5) = 1