Question

我必须使用由3个表的连接返回的值更新字段。

示例：

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

我想更新表mf_item_number的{{1}}字段值以及在上述条件下加入的其他值。

如何在MS SQL Server中执行此操作？

Answer 1

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

要说清楚...... UPDATE子句可以引用FROM子句中指定的表别名。所以im在这种情况下是有效的

通用示例

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

Answer 2

最简单的方法之一是使用公用表表达式（因为您已经在SQL 2005上）：

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弄清楚如何更新记录。

Answer 3

将其改编为MySQL - FROM中没有UPDATE条款，但这有效：

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

Answer 4

没有使用上面的sql，但这是一个基于连接语句更新表的示例。

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%'

Answer 5

您可以使用UPDATE语句中的“FROM”子句指定用于确定更新方式和内容的其他表，如下所示：

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，您需要提供条件和连接操作以将这些表绑定在一起。

马克

Answer 6

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

Answer 7

试试这个......

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;

Answer 8

您可以使用以下查询：

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`

Answer 9

您可以使用MERGE命令进行更新，同时可以更好地控制MATCHED和NOT MATCHED :(我稍微更改了源代码以证明我的观点）

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

Answer 10

使用SQL中的联接查询进行更新非常简单。您可以不使用 FROM子句来做到。这是一个示例：

    UPDATE customer_table c 

      JOIN  
          employee_table e
          ON c.city_id = e.city_id  
      JOIN 
          anyother_ table a
          ON a.someID = e.someID

    SET c.active = "Yes"

    WHERE c.city = "New york";

Answer 11

让我向所有现有答案添加警告：

在使用SELECT ... FROM语法时，请记住，它是T-SQL的专有语法，并且是不确定的。最糟糕的是，您不会得到任何警告或错误，它会顺利执行。

示例的完整说明在documentation中：

在指定FROM子句以提供更新操作的条件时请小心。如果该语句包含未指定的FROM子句，则UPDATE语句的结果是未定义的，即对于更新的每一列事件，只有一个值可用，即UPDATE语句不是确定性的。 >

Answer 12

如果您使用的是 SQL Server，则可以在不指定联接的情况下从另一个表更新一个表，只需从 where 子句中链接两个表。这使得 SQL 查询更加简单：

 UPDATE Table1
    SET Table1.col1 = Table2.col1,
        Table1.col2 = Table2.col2
    FROM
        Table2
    WHERE
        Table1.id = Table2.id

使用连接的SQL更新查询

12 个答案:

通用示例