Question

在我的代码的早期，我已经声明了一个变量（以及其他变量）：

DECLARE @ZIPFk int;

然后，不久之后，我尝试使用包含两个连接的选择表达式设置上述变量的值：

SET @ZIPFk=(SELECT Zip.id 
FROM Zip
INNER JOIN Zip5 ON Zip5.id=Zip.Zip5Fk
JOIN PlaceName ON Zip5.PlaceNameFk=PlaceName.id
WHERE PlaceName.PlaceName=@USPSComm AND Zip5.ZipCode5=@ZIPCode)

它没有工作，我无法弄清楚原因。我的结果表在字段中只有一个NULL值，我希望/希望填充@ZIPFk值。当自己运行时，除了声明的变量之外，SELECTION表达式确实会产生一个具有单行/单列/单值的表。

以下是使用声明的变量查看实际UPDATE发生的查询结尾：

UPDATE CompleteSubaddressZip 
SET ZipFk=@ZIPFk
FROM CompleteSubaddressZip as a
JOIN CompleteSubaddress AS b ON b.id=a.CompleteSubaddressFk  
WHERE (b.AddressUUID=@SelectedUUID)

而且......这是对整个事情的看法：

USE MyDatabase;
DECLARE @USPSComm varchar = 'Springville' --<--Enter USPS ZIP community name here 
DECLARE @ZIPCode varchar = '99221' --<--Enter USPS ZIP Code here
DECLARE @RowsToProcess int;
DECLARE @ZIPFk int;
DECLARE @CurrentRow int;
DECLARE @SelectedUUID uniqueidentifier;
DECLARE @UUIDTable table (RowID int not null primary key identity (1,1), UUID uniqueidentifier);

SET @ZIPFk=(SELECT a.id 
    FROM dbo.Zip AS a
    INNER JOIN Zip5 as b ON b.id=a.Zip5Fk
    JOIN PlaceName as c ON b.PlaceNameFk=c.id
    WHERE c.PlaceName=@USPSComm AND b.ZipCode5=@ZIPCode)            

INSERT INTO @UUIDTable (UUID) VALUES 
    ( 'f4x6faf4-bxx2-4166-bcd6-88c9af8ab546'), ('3e20xx5e-5edc-4735-8962-5ab3c50d053e'),
    ('696xxB2D-50DE-4361-807D-48xxD2AC5CxB')
    , ('c5879x41-e144-4ecc-8056-5493exxx1a5'), ('af7993cf-2xec-4c5f-b02e-92cb6dxxxf2b')

SET @RowsToProcess =@@ROWCOUNT 

SET @CurrentRow=0 
WHILE @CurrentRow<@RowsToProcess 
BEGIN
    SET @CurrentRow =@CurrentRow+1
    SELECT
        @SelectedUUID=UUID
        FROM @UUIDTable
        WHERE RowID=@CurrentRow

UPDATE CompleteSubaddressZip 
  SET ZipFk=@ZIPFk
    FROM CompleteSubaddressZip as a
    JOIN CompleteSubaddress AS b ON b.id=a.CompleteSubaddressFk  
    WHERE (b.AddressUUID=@SelectedUUID)
END

Answer 1

DECLARE @ZIPCode varchar = '99221' --<--Enter USPS ZIP Code here
DECLARE @RowsToProcess int;
DECLARE @ZIPFk int;
DECLARE @CurrentRow int;
DECLARE @SelectedUUID uniqueidentifier;
DECLARE @UUIDTable table (RowID int not null primary key identity (1,1), UUID uniqueidentifier);

SELECT TOP 1 @ZIPFk = Zip.id 
FROM Zip
INNER JOIN Zip5 ON Zip5.id=Zip.Zip5Fk
JOIN PlaceName ON Zip5.PlaceNameFk=PlaceName.id
WHERE PlaceName.PlaceName=@USPSComm AND Zip5.ZipCode5=@ZIPCode

INSERT INTO @UUIDTable (UUID) VALUES 
    ( 'f4x6faf4-bxx2-4166-bcd6-88c9af8ab546'), ('3e20xx5e-5edc-4735-8962-5ab3c50d053e'),
    ('696xxB2D-50DE-4361-807D-48xxD2AC5CxB')
    , ('c5879x41-e144-4ecc-8056-5493exxx1a5'), ('af7993cf-2xec-4c5f-b02e-92cb6dxxxf2b')

UPDATE CompleteSubaddressZip 
  SET ZipFk=@ZIPFk
    FROM
       CompleteSubaddressZip as a
       INNER JOIN CompleteSubaddress AS b
       ON b.id=a.CompleteSubaddressFk  
       INNER JOIN @UUIDTable u
       ON b.AddressUUID=u.UUID

Answer 2

我向任何可能阅读此主题的人道歉：我摸索着并且事实上我并不确定我已经改变了什么以纠正我的问题，这使得这个帖子几乎无用。

然而，对于后代，这是我的最终（？）查询，它实际上按预期工作。（我非常感谢用户的评论＆＃34; Matt＆＃34;谁帮我清理了东西，至少让我走上正轨，告诉我什么时候我很傻）。我拿出了循环＆＃39;并删除了不必要的变量，并通常简化了一切：

USE MyDatabase;
DECLARE @USPSComm varchar (20)='Springfield'; --  <--Enter USPS ZIP community name here 
DECLARE @ZIPCode varchar (5)='97477'; --  <--Enter USPS ZIP Code here
DECLARE @ZIPFk int;

SET @ZIPFk=(SELECT x.id
FROM Zip AS x
INNER JOIN Zip5 as y ON y.id=x.Zip5Fk
JOIN PlaceName as z ON y.PlaceNameFk=z.id
WHERE z.PlaceName=@USPSComm AND y.ZipCode5=@ZIPCode);

UPDATE a
SET ZipFk=@ZIPFk
FROM CompleteSubaddressZip as a
JOIN CompleteSubaddress AS b ON b.id=a.CompleteSubaddressFk
JOIN Zip as c ON a.ZipFk=c.id
JOIN Zip5 as d ON c.Zip5Fk=d.id
JOIN PlaceName as e ON d.PlaceNameFk=e.id  
WHERE b.AddressUUID IN ('xxxxxxxx-xxxx-UUID-xxxx-xxxxxxxxxxxx'
, 'xxxxxxxx-xxxx-UUID-xxxx-xxxxxxxxxxxx'
, 'xxxxxxxx-xxxx-UUID-xxxx-xxxxxxxxxxxx'
, 'xxxxxxxx-xxxx-UUID-xxxx-xxxxxxxxxxxx'
, 'xxxxxxxx-xxxx-UUID-xxxx-xxxxxxxxxxxx');

使用包含连接的选择表达式设置声明的变量？

2 个答案: