mysql 中order by 與group by的順序是： select from where group by order by 注意：group by 比order by先執行，order by不會對group by 內部進行排序，如果group by后只有一條記錄，那么order by 將無效。要查出group by中最大的或最小的某一字段使用 max或min函數。 例： select sum(click_num) as totalnum,max(update_time) as update_time,count(*) as totalarticle from article_detail where userid =1 group by userid order by update_time desc
