SELECT email, COUNT(email) FROM user_account GROUP BY email HAVING COUNT(email) > 1;
Delete duplicate rows using DELETE JOIN statement
DELETE t1 FROM user_account t1 INNER JOIN user_account t2 WHERE t1.id < t2.id AND t1.email = t2.email;
SELECT email, COUNT(email) FROM user_account GROUP BY email HAVING COUNT(email) > 1;
DELETE t1 FROM user_account t1 INNER JOIN user_account t2 WHERE t1.id < t2.id AND t1.email = t2.email;