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深入解析mysql中order by与group by的顺序问题
星期三, 2017-11-01 16:08 — adminshiping1
mysql 中order by 与group by的顺序是:selectfromwheregroup byorder by注意:group by 比order by先执行,order by不会对group by 内部进行排序,如果group by后只有一条记录,那么order by 将无效。要查出group by中最大的或最小的某一字段使用 max或min函数。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
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