Question

我想为每个clientid只保留1000个条目。下面的代码执行我想要的但不会遍历clientid，而是保留1000个客户端。

有没有办法在sql中执行此操作？我被告知我需要一个光标，但我希望不是。

DECLARE @ids TABLE ( id int )
DECLARE @clients TABLE ( clientid varchar(20) )

INSERT INTO @clients (clientid)
SELECT select distinct clientid FROM tRealtyTrac 

INSERT INTO @ids (id)
SELECT top 1000 id FROM tRealtyTrac WHERE clientid in (select clientid from @clients)

DELETE trealtytrac WHERE id NOT IN (select id from @ids)

Answer 1

在Oracle中

：

DELETE from CLIENTS
where CLIENT_ID = 'xxx' and
rownum > 1000

Answer 2

这是SQL Server 2005还是更高版本？怎么样的

INSERT INTO @ids (id)
SELECT id FROM (
    SELECT id, RANK() OVER (PARTITION BY clientid ORDER BY id) AS Rank FROM tRealtyTrac
) t
WHERE t.Rank <= 1000

Answer 3

我认为“在Oracle中”的答案会删除最新的条目。小心那个！

删除SQL循环

3 个答案: