关于sql server：使用连接的SQL更新查询

SQL update query using joins

我必须用3个表的联接返回的值更新一个字段。

例子：

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SELECT
im.itemid
,im.sku AS iSku
,gm.SKU AS GSKU
,mm.ManufacturerId AS ManuId
,mm.ManufacturerName
,im.mf_item_number
,mm.ManufacturerID
FROM
item_master im, group_master gm, Manufacturer_Master mm
WHERE
im.mf_item_number LIKE 'STA%'
AND im.sku=gm.sku
AND gm.ManufacturerID = mm.ManufacturerID
AND gm.manufacturerID=34

我想用在上述条件中加入的其他值更新表item_master的mf_item_number字段值。

如何在MS SQL Server中执行此操作？

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UPDATE im
SET mf_item_number = gm.SKU --etc
FROM item_master im
JOIN group_master gm
ON im.sku = gm.sku
JOIN Manufacturer_Master mm
ON gm.ManufacturerID = mm.ManufacturerID
WHERE im.mf_item_number LIKE 'STA%' AND
gm.manufacturerID = 34

为了澄清…UPDATE子句可以引用FROM子句中指定的表别名。所以在这种情况下，im是有效的。

一般实例

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UPDATE A
SET foo = B.bar
FROM TableA A
JOIN TableB B
ON A.col1 = B.colx
WHERE ...

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最简单的方法之一是使用公共表表达式(因为您已经使用了SQL 2005)：

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WITH cte AS (
SELECT
im.itemid
,im.sku AS iSku
,gm.SKU AS GSKU
,mm.ManufacturerId AS ManuId
,mm.ManufacturerName
,im.mf_item_number
,mm.ManufacturerID
, <your other field>
FROM
item_master im, group_master gm, Manufacturer_Master mm
WHERE
im.mf_item_number LIKE 'STA%'
AND im.sku=gm.sku
AND gm.ManufacturerID = mm.ManufacturerID
AND gm.manufacturerID=34)
UPDATE cte SET mf_item_number = <your other field>

查询执行引擎将自行决定如何更新记录。

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适应mysql——在UPDATE中没有FROM子句，但是这样可以：

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UPDATE
item_master im
JOIN
group_master gm ON im.sku=gm.sku
JOIN
Manufacturer_Master mm ON gm.ManufacturerID=mm.ManufacturerID
SET
im.mf_item_number = gm.SKU --etc
WHERE
im.mf_item_number LIKE 'STA%'
AND
gm.manufacturerID=34

相关讨论

没有使用上面的SQL，但下面是一个基于join语句更新表的示例。

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UPDATE p
SET p.category = c.category
FROM products p
INNER JOIN prodductcatagories pg
ON p.productid = pg.productid
INNER JOIN categories c
ON pg.categoryid = c.cateogryid
WHERE c.categories LIKE 'whole%'

您可以指定其他表，用于确定在UPDATE语句中使用"FROM"子句更新的方式和内容，如下所示：

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UPDATE item_master
SET mf_item_number = (SOME VALUE)
FROM
group_master AS gm
JOIN Manufacturar_Master AS mm ON ........
WHERE
.... (your conditions here)

在WHERE子句中，需要提供将这些表绑定在一起的条件和联接操作。

马克

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MySQL: IN general, make necessary changes par your requirement:

UPDATE
shopping_cart sc
LEFT JOIN
package pc ON sc. package_id = pc.id
SET
sc. amount = pc.amount

试试这个…

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UPDATE t1.Column1 = VALUE
FROM tbltemp AS t1
INNER JOIN tblUser AS t2 ON t2.ID = t1.UserID
WHERE t1.[column1]=VALUE AND t2.[Column1] = VALUE;

可以使用以下查询：

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UPDATE im
SET mf_item_number = (SOME VALUE)
FROM item_master im
JOIN group_master gm
ON im.sku = gm.sku
JOIN Manufacturer_Master mm
ON gm.ManufacturerID = mm.ManufacturerID
WHERE im.mf_item_number LIKE 'STA%' AND
gm.manufacturerID = 34 `sql`

您可以使用MERGE命令进行更新，对MATCHED和NOT MATCHED有更多的控制：(我稍微更改了源代码以证明我的观点)

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USE tempdb;
GO
IF(OBJECT_ID('target') > 0)DROP TABLE dbo.target
IF(OBJECT_ID('source') > 0)DROP TABLE dbo.source
CREATE TABLE dbo.Target
(
EmployeeID INT ,
EmployeeName VARCHAR(100) ,
CONSTRAINT Target_PK PRIMARY KEY ( EmployeeID )
);
CREATE TABLE dbo.Source
(
EmployeeID INT ,
EmployeeName VARCHAR(100) ,
CONSTRAINT Source_PK PRIMARY KEY ( EmployeeID )
);
GO
INSERT dbo.Target
( EmployeeID, EmployeeName )
VALUES ( 100, 'Mary' );
INSERT dbo.Target
( EmployeeID, EmployeeName )
VALUES ( 101, 'Sara' );
INSERT dbo.Target
( EmployeeID, EmployeeName )
VALUES ( 102, 'Stefano' );

GO
INSERT dbo.Source
( EmployeeID, EmployeeName )
VALUES ( 100, 'Bob' );
INSERT dbo.Source
( EmployeeID, EmployeeName )
VALUES ( 104, 'Steve' );
GO

SELECT * FROM dbo.Source
SELECT * FROM dbo.Target

MERGE Target AS T
USING SOURCE AS S
ON ( T.EmployeeID = S.EmployeeID )
WHEN MATCHED THEN
UPDATE SET T.EmployeeName = S.EmployeeName + '[Updated]';
GO
SELECT '-------After Merge----------'
SELECT * FROM dbo.Source
SELECT * FROM dbo.Target