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

You could add to the WHERE clause:

AND NOT EXISTS (SELECT NULL FROM addon a2
                WHERE  a2.addon_id IN (1,14,237)
                AND NOT EXISTS
                ( SELECT NULL
                  FROM   product_addon pa2
                  WHERE  pa2.addon_id = a2.addon_id
                  AND    pa2.product_id = p.product_id
                )
               )

Or equivalently:

AND NOT EXISTS (SELECT NULL FROM addon a2
                LEFT JOIN product_addon pa2
                  ON pa2.addon_id = a2.addon_id
                 AND pa2.product_id = p.product_id
                WHERE a2.addon_id IN (1,14,237)
                AND   pa2.product_id IS NULL
                )
               )

Answer 2

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