看程式碼吧~

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,9)
  ) AS A
 ORDER BY
  xzqdm,xzdm,sl
) SELECT
 xzqdm,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,count(*) sl from sddltb_qc where xzqdm in ('130432','210604') group by xzqdm,9)) as a order by xzqdm,sl

執行結果：

新增行序號：ROW_NUMBER () OVER (ORDER BY A.bsm ASC) AS 序號

分組新增序號：ROW_NUMBER () OVER (PARTITION BY xzqdm ORDER BY A.bsm ASC) AS 序號

補充：pgsql 表隨機取幾條資料

取100條

select * from map_route_info_composite order by random() limit 100

以上為個人經驗，希望能給大家一個參考，也希望大家多多支援我們。如有錯誤或未考慮完全的地方，望不吝賜教。