看代码吧~
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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, slFROM ( SELECT *, ROW_NUMBER () OVER ( PARTITION BY xzqdm ORDER BY sl DESC ) AS Row_ID FROM Name ) AS AWHERE Row_ID <= 2ORDER BY xzqdm |
其中
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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
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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服务器之家。如有错误或未考虑完全的地方，望不吝赐教。
原文链接：https://www.cnblogs.com/SeNaiTes/p/11540524.html
