Question

我有两张桌子：

地址（有1000多行）
GoverningBody，（仅有7个）

dbo.GoverningBody使用dbo.Address.AddressID链接（唯一ID）

我想更新所有address1列（来自dbo.Address）我的内部联接dbo.address.addressID =dbo.governingbody.addressID：

SELECT 
    GB.GoverningBodyName,
    Ad.Address1,
    Ad.AddressID,
    GB.GoverningBodyID
FROM
    Address Ad
INNER JOIN 
    (SELECT 
         GoverningBodyID,
         AddressID,
         GoverningBodyName
     FROM   
         GoverningBody) GB ON ad.AddressID = gb.AddressID

我想将Address1值更新为：

'Test1','Test2','Test3' etc...

希望这是有道理的。

谢谢，

萨姆

Answer 1

SELECT SUM(UNCOLLECTED)
FROM LIQUIDATIONSDETAILS LD JOIN
     ??? L       -- I don't know what table "L" refers to
     ON LD.COMPANYID = L.COMPANYID AND
        LD.GROUPID = L.GROUPID AND
        LD.PERIODID = L.PERIODID 
WHERE LD.FORMTYPE IN (1, 2, 3) OR
      (LD.FORMTYPE = 4 AND L.PERIODID > '2013-2014')

Answer 2

SQL Server 2008具有ROW_NUMBER功能。

我将您的查询包装到CTE（公用表表达式）中，并带有行号的额外列并更新CTE。您可以使用ORDER BY函数中的ROW_NUMBER来确定如何将数字分配给行。

顺便说一句，您的INNER JOIN并不真正需要子查询，它可以用更简单的形式编写。优化器足够智能，只能读取所需的列。事实上，在UPDATE查询中，您不需要GoverningBodyName和GoverningBodyID列，而且很可能是优化者不会阅读它们。

WITH
CTE
AS
(
    SELECT 
        GB.GoverningBodyName,
        Ad.Address1,
        Ad.AddressID,
        GB.GoverningBodyID,
        ROW_NUMBER() OVER (ORDER BY Ad.AddressID) AS rn
    FROM
        Address AS Ad
        INNER JOIN GoverningBody AS GB ON ad.AddressID = gb.AddressID
)
UPDATE CTE
SET Address1 = 'Test' + CAST(rn as varchar(10))
;

如何更新内部联接结果？

2 个答案: