深入解析mysql中order by与group by的顺序问题_MySQL
- WBOYOriginal
- 2016-06-01 13:24:591221browse
bitsCN.com
mysql 中order by 与group by的顺序是：
select
from
where
group by
order 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 descbitsCN.com
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