Question

我有一个复杂的select语句，例如：

SELECT * 
FROM [Orders] a 
INNER JOIN [Customers] b ON a.CustomerID = b.CustomerID
WHERE CustomerName LIKE '%Wilman%'

这给了我需要的行，然后我希望能够UPDATE几乎这样的行：

UPDATE ([Orders] a 
INNER JOIN [Customers] b ON a.CustomerID = b.CustomerID
WHERE CustomerName LIKE '%Wilman%') 
SET ShipperID = 10

显然这不起作用，但我在Microsoft SQL Server中使用哪种逻辑？

Answer 1

必须是：

UPDATE
    Orders
SET
    ShipperID = 10
FROM
    [Orders] a INNER JOIN [Customers] b on a.CustomerID=b.CustomerID   
WHERE
    CustomerName LIKE '%Wilman%

Answer 2

只要SELECT语句返回唯一列名并满足可更新视图的条件，您就可以将其放入派生表或CTE中并更新它。

UPDATE (SELECT a.ShipperID
        FROM   [Orders] a
               INNER JOIN [Customers] b
                 ON a.CustomerID = b.CustomerID
        WHERE  CustomerName LIKE '%Wilman%') AS T
SET    ShipperID = 10

Answer 3

您需要UPDATE/FROM

UPDATE o
SET ShipperID = 10
FROM Orders o
INNER JOIN Customers c ON c.CustomerID = o.CustomerID
WHERE c.CustomerName LIKE '%Wilman%'

Answer 4

您可以使用common table expression。假设ShipperID是Orders的列，并假设CustomerName是Customers的列（顺便提一下，最好的做法是始终在JOIN中为您的列添加前缀防止未来架构更改出现意外）：

WITH OrdersToUpdate AS (
    SELECT [Orders].*
    FROM [Orders]
    INNER JOIN [Customers] ON [Orders].CustomerID = [Customers].CustomerID
    WHERE [Customers].CustomerName LIKE '%Wilman%'
)
UPDATE OrdersToUpdate SET ShipperID = 10;

此技术特别有用，因为它可以让您在不重写查询的情况下查看将更新（或删除，如果您使用DELETE）。

在Microsoft SQL Server中更新SELECT语句的结果

4 个答案: