自己常用的SQL查询语句
时间:2022-03-14 02:18
排序并去除重复
排序用group by
去除重复用max(expr)
SELECT ed.ID,ed.`NAME`,ed.RATIO,max(e.DLDT),e.TAE,e.TAE/ed.RATIO from e_eledata e , e_elemeterhead ed where e.E_ELEMETERHEAD_ID = ed.ID and ed.`STATUS` = '0' group by ed.ID,ed.`NAME`,ed.RATIO ;