DELETE FROM tmp_debug WHERE Id NOT IN (SELECT Id FROM tmp_debug ORDER BY Id DESC LIMIT 2)
-- DELETE FROM tmp_debug WHERE Id NOT IN (SELECT * FROM ((SELECT Id FROM tmp_debug ORDER BY Id DESC LIMIT 2)) AS t)
DELETE FROM tmp_debug WHERE Id NOT IN (SELECT Id FROM tmp_debug ORDER BY Id DESC LIMIT 2)
-- DELETE FROM tmp_debug WHERE Id NOT IN (SELECT * FROM ((SELECT Id FROM tmp_debug ORDER BY Id DESC LIMIT 2)) AS t)