Probeer deze zoekopdracht -
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;
Gebruik dan UITLEG om zoekopdrachten te analyseren.
SELECT t1.* FROM foo t1
LEFT JOIN foo t2
ON t1.id < t2.id AND t1.uid = t2.uid
WHERE t2.id is NULL;