mysql 分组后 各个组内进行多字段排序, 获取组内第一个数据的完整值
SELECT a.*, c.`name` reservoirName
FROM
数据表 a
INNER JOIN ( SELECT SUBSTRING_INDEX(GROUP_CONCAT(id ORDER BY op_time DESC, id DESC),',',1) id FROM 数据表 GROUP BY code ) b ON a.id = b.id
SELECT a.*, c.`name` reservoirName
FROM
数据表 a
INNER JOIN ( SELECT SUBSTRING_INDEX(GROUP_CONCAT(id ORDER BY op_time DESC, id DESC),',',1) id FROM 数据表 GROUP BY code ) b ON a.id = b.id