postgresql 取出分组中最大的几条数据

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【扫一扫了解最新限行尾号】
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WITH Name AS (
SELECT
*
FROM
(
SELECT
xzqdm,
SUBSTRING (zldwdm, 1, 9) xzdm,
COUNT (*) sl
FROM
sddltb_qc
WHERE
xzqdm IN ('', '')
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：