Fetching only rows that match all entries in a joined table (SQL)

Question

I have the following five tables:

• ISP
• Product
• Connection
• AddOn
• AddOn/Product (pivot table for many-to-many relationship).

Answer 1

GROUP BY set-of-column
HAVING SUM(CASE WHEN ISNULL(pa.addon_id, 0) IN (1,14,237) THEN 1 ELSE 0 END) = 3