156-mysql 删除重复数据

-- 删除重复数据
DELETE FROM ww_baidu_data_copy1 WHERE id NOT IN (
	SELECT t.min_id FROM (
		-- 过滤出重复多余的数据，
		SELECT MIN(id) AS min_id FROM ww_baidu_data_copy1 GROUP BY stat_date ,baidu_uid
  ) t
)