SELECT id_art, id_ent, count(*)
FROM latable
GROUP BY id_art, id_ent
HAVING count(*) > 1
SELECT DISTINCT id_art, id_ent
INTO table_temp
FROM latable
GROUP BY id_art, id_ent
HAVING COUNT(*) > 1
DELETE
FROM latable t1
WHERE EXISTS (SELECT *
FROM latable t2
WHERE t1.id_art = t2.id_art
AND t1.id_ent = t2.id_ent
GROUP BY id_art, id_ent
HAVING COUNT(*) > 1)
INSERT INTO latable
SELECT id_art, id_ent
FROM table_temp
DROP TABLE table_temp
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