Question

请参阅以下查询：

select thisdate,created from dbusns d
INNER JOIN (SELECT  MAX(created) created,
                    C.reference 
            FROM dbusns
            INNER JOIN [server].CUSTODYDB.DBO.dbcustody C
                ON dbusnS.urns = C.reference
            WHERE dbusns.datasetname = 'CUSTODY'
            GROUP BY C.reference) T on D.urns = T.reference
WHERE D.urns = '1'

返回：2008-10-31 00：00：00.000,2008-11-01 00：00：00.000

然后我运行以下查询：

UPDATE D
SET thisdate = T.created
FROM dbusns D
INNER JOIN (SELECT  MAX(created) created,
                    C.reference 
            FROM dbusns
            INNER JOIN [server].CUSTODYDB.DBO.dbcustody C
                ON dbusnS.urns = C.reference
            WHERE dbusns.datasetname = 'CUSTODY'
            GROUP BY C.reference) T on D.urns = T.reference
WHERE D.urns = '1'

然后我运行下面的查询，返回：2008-10-31 00：00：00.000（应该是：2008-11-01 00：00：00.000）

select THISDATE from dbusns where datasetname='CUSTODY' AND URNS='1'

已创建且ThisDate为日期时间。如果我将dbcustody中的记录数减少到29,598，则值会正确更新。我试图删除第29,598条记录，但这不起作用。

发生了什么事？它似乎是执行计划不正确，因为它发送的远程查询是：

SELECT TOP 1 created FROM dbcustody where reference='1'

为什么不发送MAX语句/ ORDER BY创建desc？

Answer 1

编辑：删除了一些不相关的内容。

过去发生这种情况时，我通常采用OPENQUERY来解决这个问题。试试这个：

UPDATE D
SET thisdate = T.created
FROM dbusns D
INNER JOIN (SELECT MaxCreated, Reference FROM OPENQUERY(server, 'SELECT MAX(created) MaxCreated, reference
    FROM CUSTODYDB.DBO.dbcustody') as RemoteTable
    INNER JOIN dbusns ON dbusnS.urns = RemoteTable.reference
    WHERE dbusns.datasetname = 'CUSTODY'
    GROUP BY RemoteTable.reference) T ON D.urns = T.reference
WHERE D.urns = '1'

UPDATE与链接服务器无法正常工作

1 个答案: