Renvoyer la 'dernière' ligne de chaque 'group by' dans MySQL

Essayez cette requête -

SELECT t1.* FROM foo t1
  JOIN (SELECT uid, MAX(id) id FROM foo GROUP BY uid) t2
    ON t1.id = t2.id AND t1.uid = t2.uid;

Ensuite, utilisez EXPLAIN pour analyser les requêtes.

SELECT t1.* FROM foo t1
  LEFT JOIN foo t2
    ON t1.id < t2.id AND t1.uid = t2.uid
WHERE t2.id is NULL;