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Add Lookup Column to existing DB on SQL2005

Posted on 2011-03-11
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Last Modified: 2012-05-11
No real question per se. I am just not good at this and do not want to destroy any data.

I created a Column in Access and transfered it to the existing DB via the upload Wizard. (Customers) - I filled a few Dummy Customers in and I can access it through our adp on the new form.

here's where I need the help.

Existing Database (tblDATA) does not have a Customers Column which refers to this now. - I am so not the person to do this but I am stuck with it.

Can anyone guide me step by step on how to create a column in SQL Management Studio and link it with this Customers Table I created?

There are many more linked Tables in there (tblStatus, tblDepartments and they all have an FK, int, not null) description after the name but "alas" I'm too dumb for this :-/

Step by Step solution appreciated - and I promise if it works I'll add a few Boni points :)
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Question by:sktmx13
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lcohan earned 1500 total points
ID: 35111955
Ok, so you have tblDATA that has a column lets call it "CustomerName" right?
You want to add a matching CustomerId to that CustomerName so you can use your Customers table instead for ALL Customers related data right?
Assuming all these and if your Customers table has a Id (int),Name(varchar)....columns here's what I would do:

Add CustomerId column to tbldDATA like

ALTER TABLE tblDATA add CustomerId int null;

Populate it from Customers table

UPDATE tblDATA SET CustomerId = Customers.Id
FROM Customers
WHERE tblDATA.CustomerNAme = Customers.Name

Then you could add a FK one to many from Customers(one) table you created to tblDATA(many)

 - no worries to add new column to a table won't cause any data los however...bad written queries against tblDATA may fail. I mean any INSERT INTO ....SELECT * FROM tblDATA will fail becaus the table structure was changed.
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Author Comment

by:sktmx13
ID: 35113598
The answer is totally appreciated but I am not sure if we're on the same page.

My Customer Table has 2 columns

ID - AutoNumber
CustomerName - Text 255 Chars (mostly Business Names)

I created a few Customers such as CableVision, Charter, etc...  and upsized that table to the existing SQL Database.

tblData has many existing columns but no CustomerName yet.

--------------------------------------------------------------------------------------------------------

If we're one the same page - then where do I enter the code you gave me? And how could I add a FK one to many... ?
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Author Closing Comment

by:sktmx13
ID: 35359667
I figured it out but would have appreciated a more in depth approach
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