INNER JOIN within UPDATE OUTPUT in one t-sql query

Question

Need to INNER JOIN a resultset returned by UPDATE OUTPUT with another table and return results. Is it possible?

Here is a small example:

CREATE TABLE [dbo].[Customers]
(   
   [CustomerId] [int],   
   [CustomerName]  [nvarchar](50)
)
GO

CREATE TABLE [dbo].[Orders]
(   
   [OrderId] [int],   
   [OrderName]  [nvarchar](50)
)
GO

CREATE TABLE [dbo].[CustomerOrders]
(   
   [CustomerId] [int],   
   [OrderId]  [int]
)
GO

INSERT INTO CustomerOrders (CustomerId, OrderId) VALUES (1, 1)
INSERT INTO CustomerOrders (CustomerId, OrderId) VALUES (1, 2)
INSERT INTO CustomerOrders (CustomerId, OrderId) VALUES (2, 1)
GO

Need to update OrderId on CustomerOrders table and return names of the customers, all in 1 shot. So far I can only return CustomerIds:

UPDATE CustomerOrders SET OrderId=NULL 
OUTPUT Deleted.CustomerId
WHERE OrderId='1'

Solution

TSQL/SQL Server 2005+ supports JOINs in the UPDATE clause - see the documentation:

UPDATE CUSTOMERORDERS
   SET orderid = NULL
OUTPUT c.customername
  FROM CUSTOMERORDERS co
  JOIN CUSTOMERS c ON c.customerid = co.customerid