Deltag og flere og betingelser

Du skal bruge en kombination af IN() og GROUP BY ... HAVING at opnå dette. Det er heller ikke nødvendigt at deltage, hvis alt hvad du behøver er bruger-id'er. Så noget i stil med:

SELECT user, COUNT(attribute) AS attribute_count
FROM attributes
WHERE attribute IN(...) /* include your set of attributes here */
GROUP BY user
HAVING attribute_count = ? /* include number equal to number of attribute ID's in IN() above */

Hvis du har brug for bruger-id'er og navne, kan du blot tilslutte dette postsæt afledt af forespørgslen ovenfor som et filter til brugertabellen:

SELECT user.id, user.name
FROM user
INNER JOIN
  (
    SELECT user, COUNT(attribute) AS attribute_count
    FROM attributes
    WHERE attribute IN(...) /* include your set of attributes here */
    GROUP BY user
    HAVING attribute_count = ? /* include number equal to number of attribute ID's in IN() above */
  ) AS filter
  ON user.id = filter.user