如何从单行创建多行（SQL Server 2008）

Question

In our organisation we have a central purchasing company (CPC) who then sells to our retail company (Company_X) via an intercompany PO, who then sells on to the customer. What I need to do is link our retail sale back to the original purchase order.

For example I have a table which contains the following (and a multitude of other columns):

Company_X_Sales :

InterCO_PO_no  Sales_Order_No  Part_No  Qty
-------------  --------------  -------  ---
12345          98765           ABCD     10

I then have a table which has the following:

CPC_Sales :

PO_Number  InterCO_SO_No  Part_No  Qty
---------  -------------  -------  ---
00015      12345          ABCD     5  
00012      12345          ABCD     2  
00009      12345          ABCD     4   
00007      12345          ABCD     3 

So you can see that the final sale of 10 items was made up of parts which came from more than 1 external POs in the central company.

What I need to be able to do is replicate the rows in Company_X_Sales , include the Original PO Number and set the quantities as in CPC_Sales .

I need to end up with something like this:

Company_X_Sales_EXTD :

PO_Number  InterCO_PO_no  Sales_Order_No  Part_No  Qty
---------  -------------  --------------  -------  ---
00007      12345          98765           ABCD     3
00009      12345          98765           ABCD     4
00012      12345          98765           ABCD     2
00015      12345          98765           ABCD     1

I have to use the Company_X_Sales as my driving table - the CPC_Sales is simply as a lookup to derive the original PO Number.

Hoping you can help I am working through the weekend on this as it is part of a piece of work which has a very aggressive timescale.

I do not mind if the solution requires more than one pass of the table or creation of views if needed. I am just really really struggling.

Answer 1

I'm a little confused by your question, but it sounds like you're trying to make your Company_X_Sales table have 3 rows instead of 1, just with varying quantities? If so, something like this should work:

SELECT S.PO_Number, C.InterCO_PO_no, C.Sales_Order_No, C.Part_No, S.Qty
FROM Company_X_Sales C
   JOIN CPC_Sales S ON C.InterCO_PO_no = S.InterCO_SO_No

Here is the SQL Fiddle .

That will give you the 4 rows with the correct quantities. Then you can delete and reinsert accordingly.

To get those rows into the table, you have a few options, but something like this should work:

--Flag the rows for deletion
UPDATE Company_X_Sales SET Qty = -1 -- Or some arbitrary value that does not exist in the table

--Insert new correct rows
INSERT INTO Company_X_Sales 
SELECT C.InterCO_PO_no, C.Sales_Order_No, C.Part_No, S.Qty
FROM Company_X_Sales C
   JOIN CPC_Sales S ON C.InterCO_PO_no = S.InterCO_SO_No

--Cleanup flagged rows for deletion
DELETE FROM Company_X_Sales  WHERE Qty = -1

Good luck.

Answer 2

select [PO_Number],[InterCO_SO_No], Company_X_Sales.Sales_Order_No, [Part_No],[Qty] from CPC_Sales inner join Company_X_Sales on Company_X_Sales.InterCO_PO_no = CPC_Sales.InterCO_SO_no

在两个表上进行简单的内部联接将为您提供所需的结果恕我直言。