SQL to update records from different tables

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Hi
I am trying to update a table which is missing some data, but having problems with the update statement.

I have the following tables and data:

Customer table 1:

CustomerID: 1234
CustomerName: John
CustomerContact: 0189541145

Orders table 2:
CustomerId: blank
OrderNumber: 12345
OrderType: paper

how can i update the table to also have customer ID:

SQL

update Orders
set customerID = c.CustomerID
from Customer
where customerID = 12345

Posted 29-Jun-15 1:07am

Geofferz

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[no name] 29-Jun-15 7:37am

--UPDATE
UPDATE ORDERS SET CUSTOMERID =(SELECT C.CUSTOMERID FROM CUSTOMER C WHERE C.CUSTOMERID = 12345)

OR

--DECLARE
DECLARE @CUSTOMERID INT
--SET
SET @CUSTOMERID = CUSTOMERID FROM CUSTOMER WHERE CUSTOMERID = 12345
--UPDATE
UPDATE ORDERS SET CUSTOMERID = @CUSTOMERID

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Abhinav S · Accepted Answer · 2015-06-29T01:18:00

Solution 1

Since there is nothing common between the customer and orders table and the customer id is blank, there is no way to set null customer ids to a value automatically.

You have to manually update rows in the Order table by using the order id -
Update Orders set customerId = ?? where Order Number = 123456

Posted 29-Jun-15 1:18am

Abhinav S

Comments

Geofferz 29-Jun-15 7:21am

Awesome thanks that helped me point me in right direction :)