从临时表更新

查询：

SELECT ID, T.c.value('@Address', 'nvarchar(20)' ) as Address
INTO #TMP
FROM TABLE1
    CROSS APPLY XMLData.nodes('/Document') AS T(c)
UPDATE TABLE1
SET HomeAddress = (SELECT TOP 1 t.Address
                   FROM #TMP t
                   WHERE t.ID = ID)

主要是，我需要将数据OUT从XML字段复制到同一表中的普通字段。

问题：

为什么所有记录都会在表1中显示家庭地址
Cursor真的是更新Table1值的唯一方法吗

UPDATE T2
SET HomeAddress = t1.address
FROM TABLE2 t2
join TABLE1 t1 on T1.ID = t2.HomeAddressID
and t2.HomeAddress <> t1.address

使用联接。不需要临时表或相关的子查询。

如果表1处于一对多关系中，那么下面是处理这种关系的一些可能性。如果您有一个值表示一个且只有一个记录(我们的系统中有一个字段可以选择最重要的地址，它是通过触发器来维护的，以确保唯一性(，请尝试以下操作：

UPDATE T2
SET HomeAddress = t1.address
FROM TABLE2 t2
join TABLE1 t1 on t1.ID = t2.HomeAddressID
WHERE t1.somefield = 'somevalue'
and t2.HomeAddress <> t1.address

如果您需要根据其他字段(例如最近的日期(创建唯一记录，请尝试以下变体：

UPDATE T2
SET HomeAddress = t1.address
FROM TABLE2 t2
join TABLE1 t1 on t1.ID = t2.HomeAddressID
join (select id, max(somedatefield) from  table1 group by id) t3 on t3.id = t1.id
Where  t2.HomeAddress <> t1.address

在更新时，我需要完全量化表，如下所示：

UPDATE TABLE1 SET TABLE1.HomeAddress = (SELECT TOP 1 t.Address  
               FROM #TMP t  
               WHERE t.ID = TABLE1.ID)

SELECT P.TipoComprob,P.NoComprob,C.Importe as ImpIVA1,ROUND(100/P.ImpGravado*C.Importe,1)
 as PorcIVA1 
       INTO #Temporal
       FROM ComprobProv AS P
       LEFT JOIN PasesCompras AS C ON C.TipoComprob=P.TipoAsiento AND 
C.NoComprob=P.NoComprob
WHERE P.PorcIVA1 =0 and P.CatIVA = 'Ri' AND P.ImpGravado>0 AND C.CodCuenta=110303010 AND ROUND(100/P.ImpGravado*C.Importe,1) IN (21.00,10.50,27.00);
go
select * from #Temporal;
go
UPDATE 
   t1 
SET 
   t1.ImpIVA1 =  t2.ImpIVA1, t1.PorcIVA1 = t2.PorcIVA1
FROM
   dbo.ComprobProv t1
   INNER JOIN #Temporal t2
   ON t1.TipoComprob = t2.TipoComprob AND t1.NoComprob = t2.NoComprob;
go

--请注意，"GO"对于在SQL Server 2017中保留上下文非常重要，否则您会发现"未知字段名"错误。

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