Question

Declare @modCode varchar(3)
SET @modCOde = 'SOR';

UPDATE  Doc_SalesOrder
SET     OLD_SP.Num = NEW_SP.NewNum
FROM    Doc_SalesOrder as OLD_SP
INNER JOIN
(
     Select
       Id,
       dbo.ApplyModuleCode(@modCode,Num) as NewNum 
     From Doc_SalesOrder
     Where Num not LIKE '%'+@modCOde+'%'
)NEW_SP ON OLD_SP.Id = NEW_SP.Id

When I run the query the error is:

The multi-part identifier “OLD_SP.Num” could not be bound.

Why?

Answer 1

Use

UPDATE  OLD_SP
SET     OLD_SP.Num = NEW_SP.NewNum
FROM    Doc_SalesOrder as OLD_SP /* .... */

Or just simply drop the table prefix in the set statement target entirely. There is no ambiguity here.

UPDATE  Doc_SalesOrder
SET     Num = NEW_SP.NewNum
FROM    Doc_SalesOrder as OLD_SP /* .... */