sql多字段分組，取某個屬性最大的那一條數據中，某一個字段值。那個字段是不一樣的，不能出現在GROUP BY中

	//   想要的字段值不能通過分組取最大的方式獲取到，應該如何處理？
	//1、分組取出最大的理想數據
	//2、通過理想數據中，能夠確定唯一數據的關鍵字段，再次關聯join之前的表，
	//3、關聯出之前的表後，即可取到想要數據中的想要字段！
SELECT
	s.id AS '主表 id',
	p.id AS '子表 id' 
FROM
	(
SELECT
	max( sp.start_date ) startDate,
	max( sp.update_date ) updateDate,
	spl.project_id AS customerId,
	spl.varieties_id AS varietiesId 
FROM
	t_sales_price_list_去掉 spl
	JOIN t_sales_price_去掉 sp ON spl.price_id = sp.id 
WHERE
	spl.STATUS = '0' 
	AND spl.enable_flag = '1' 
	AND sp.STATUS = '0' 
	AND sp.flow_type = '0' 
	AND sp.company_code = '0107' 
	AND sp.start_date <= '2020-02-26 00:00:00.0' 
GROUP BY
	customerId,
	varietiesId 
	) m
	JOIN t_sales_price_list_去掉 p ON m.customerId = p.project_id 
	AND m.varietiesId = p.varieties_id
	JOIN t_sales_price_去掉 s ON p.price_id = s.id 
	AND m.startDate = s.START_DATE 
	AND m.updateDate = s.update_date
	JOIN js_sys_user_去掉 u ON u.user_code = s.create_by
	JOIN t_customer_list_去掉 c ON c.id = p.project_id
	JOIN t_sales_area_set_去掉 sae ON c.area = sae.id 
WHERE
	1 =1