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

This alternative has the benefit of a constant statement structure and only one parameter, independent of the amount of relations you are looking for:

SELECT parent_id FROM rel 
GROUP BY parent_id 
HAVING GROUP_CONCAT(prop_id ORDER BY prop_id ASC SEPARATOR ",") = '1,5';

Disadvantages:

• You need to prepare an ordered, comma separated String of prop_ids upfront.
• This works on MySQL, but not all database servers.