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DROP TABLE IF EXISTS tmp_table;
CREATE TEMPORARY TABLE tmp_table (id INT);

INSERT  tmp_table
SELECT  id
FROM    table_a t1
WHERE   EXISTS (
          SELECT  *
          FROM    table_a t2
          WHERE   t2.some_id = t1.some_id
          AND     t2.another_id = t1.another_id
          AND     t2.id < t1.id
        )
;

DELETE FROM table_a WHERE id IN (SELECT id FROM tmp_table);