铁雪资源网 Design By www.gsvan.com
看代码吧~
WITH Name AS ( SELECT * FROM ( SELECT xzqdm, SUBSTRING (zldwdm, 1, 9) xzdm, COUNT (*) sl FROM sddltb_qc WHERE xzqdm IN ('130432', '210604') GROUP BY xzqdm, SUBSTRING (zldwdm, 1, 9) ) AS A ORDER BY xzqdm, xzdm, sl ) SELECT xzqdm, xzdm, sl FROM ( SELECT *, ROW_NUMBER () OVER ( PARTITION BY xzqdm ORDER BY sl DESC ) AS Row_ID FROM Name ) AS A WHERE Row_ID <= 2 ORDER BY xzqdm
其中
select * from (select xzqdm,substring(zldwdm,1,9) xzdm,count(*) sl from sddltb_qc where xzqdm in ('130432','210604') group by xzqdm,substring(zldwdm,1,9)) as a order by xzqdm,xzdm,sl
执行结果:
添加行序号:ROW_NUMBER () OVER (ORDER BY A.bsm ASC) AS 序号
分组添加序号:ROW_NUMBER () OVER (PARTITION BY xzqdm ORDER BY A.bsm ASC) AS 序号
补充:pgsql 表随机取几条数据
取100条
select * from map_route_info_composite order by random() limit 100
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。如有错误或未考虑完全的地方,望不吝赐教。
铁雪资源网 Design By www.gsvan.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
铁雪资源网 Design By www.gsvan.com
暂无postgresql 实现取出分组中最大的几条数据的评论...