How To Keep Records in Order from Derived Table - sql

Question

I am trying to update a SQL table from a remote DB2 table. There may be multiple updates for the same record but I need the updates to happen in the order they are in in the DB2 table. You can not use Order By on a derived table. I have tried several different options to try to get this to work, but the updates still do not happen in order.
For example:
Change 1 - CUSTOMER NAME = ABCX
Change 2 - CUSTOMER NAME = ABC
After I run the query, the customer name is ABCX when it should be ABC.
I truly do not know what else to try. I've tried temp tables (still derived table), creating a concatenated field with date and time fields, sub-select, row_number() over(order by date, time) and many other things. I'd like to keep it in order by the date and time fields in the remote table.
Any insight would be appreciated.
Thank you.
Here is the basic code I have:
SET
A.CUSRID = B.RECORD_ID,
A.CUSSTS = B.ACTIVE_CODE,
A.CUSCOM = B.COMPANY_NUMBER,
A.CUSMNM = B.CUSTOMER_NAME,
A.CUSAD1 = B.CUSTOMER_ADDRESS_1,
A.CUSAD2 = B.CUSTOMER_ADDRESS_2,
A.CUSAD3 = B.CUSTOMER_ADDRESS_3,
A.CUSZIP = B.CUSTOMER_ZIP_CODE,
A.CUSZPE = B.CUSZPE_NOT_USED,
A.CUSSTC = B.CUSTOMER_STATE,
A.CUSARA = B.CUSTOMER_AREA_CODE,
A.CUSPHN = B.CUSTOMER_PHONE,
A.CUSB17 = B.CUSB17_NOT_USED,
A.CUSTMT = B.STATEMENT_PRINT_CODE,
A.CUSCRL = B.CREDIT_LIMIT,
A.CUSCRC = B.CREDIT_CODE,
A.CUSMCD = B.CUSMCD_NOT_USED,
A.CUSTX1 = B.TAX_RATE_1,
A.CUSTX2 = B.TAX_RATE_2,
A.CUSTXC = B.TAX_RATE,
A.CUSTXE = B.TAX_EXEMPT_ID,
A.CUSB48 = B.CUSB48_NOT_USED,
A.CUSMDT = B.MAINTENANCE_DATE,
A.CUSB20 = B.CUSB20_NOT_USED,
A.CSSRCH = B.SEARCH_FIELD,
A.CUSBRN = B.BRANCH_ID,
A.CUSDST = B.DISTRIBUTOR_NUMBER,
A.CUSB28 = B.CUSB28_NOT_USED
FROM
dbo.mcusmas A
INNER JOIN (
SELECT
RECORD_ID,
ACTIVE_CODE,
COMPANY_NUMBER,
CUSTOMER_NUMBER,
CUSTOMER_NAME,
CUSTOMER_ADDRESS_1,
CUSTOMER_ADDRESS_2,
CUSTOMER_ADDRESS_3,
CUSTOMER_ZIP_CODE,
CUSZPE_NOT_USED,
CUSTOMER_STATE,
CUSTOMER_AREA_CODE,
CUSTOMER_PHONE,
CUSB17_NOT_USED,
STATEMENT_PRINT_CODE,
CREDIT_LIMIT,
CREDIT_CODE,
CUSMCD_NOT_USED,
TAX_RATE_1,
TAX_RATE_2,
TAX_RATE,
TAX_EXEMPT_ID,
CUSB48_NOT_USED,
MAINTENANCE_DATE,
CUSB20_NOT_USED,
SEARCH_FIELD,
BRANCH_ID,
DISTRIBUTOR_NUMBER,
CUSB28_NOT_USED,
FROM remoteserver.MCUSMASPLG
WHERE Event_State_ID = '*New' AND SENT_TO_DATA_WAREHOUSE = 'N'
) B
ON A.CUSMNB = B.CUSTOMER_NUMBER

Answer 1

There is no "change 1" or "change 2". There are only rows and SQL Server arbitrarily ends up using one of them. If you want to control the rows, you should select the one you want in advance:
FROM dbo.mcusmas A JOIN
(SELECT B.*,
ROW_NUMBER() OVER (PARTITION BY CUSTOMER_NUMBER ORDER BY <ordering col>) as seqnum
FROM remoteserver.MCUSMASPLG
WHERE Event_State_ID = '*New' AND
SENT_TO_DATA_WAREHOUSE = 'N'
) B
ON A.CUSMNB = B.CUSTOMER_NUMBER
I don't know how you are determining which row is the right one. Presumably, some column has this information and you can use it in the ORDER BY.