mysql remove duplicates
DELETE FROM table_name WHERE id NOT IN ( SELECT id FROM table_name GROUP BY field_1, field_2)
mysql remove duplicates
DELETE FROM table_name WHERE id NOT IN ( SELECT id FROM table_name GROUP BY field_1, field_2)
mysql delete duplicate rows but keep one
DELETE c1 FROM contacts c1 INNER JOIN contacts c2 WHERE c1.id > c2.id AND c1.email = c2.email;
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