mysql同一个数据值，获取最新的一条数据

SELECT
	* 
FROM
	(
	SELECT
		t.store_id,
		t.insert_time,
	IF
		( @store_id = t.store_id, @ranks := @ranks + 1, @ranks := 1 ) AS ranks,
		@store_id := t.store_id 
	FROM
		( SELECT store_id, insert_time FROM sy_t_advance_order ORDER BY store_id, insert_time DESC ) t,
		( SELECT @store_id := NULL, @ranks := 0 ) s 
	) dfdf 
WHERE
	ranks = 1