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Updating unique rows to become non-unique in SQL Server

I have a table with 3 columns containing values in rowid, documentNumver, customerNumber.

Col 2 contains mostly unique values although not always the case. The same is the case with col 3.

There are cases where for a particular documentNumber, there are a number of customerNumbers which are all unique.
In this cases, what I need to do is make the documentNumber unique for each customerNumber by changing the 3rd and 4th characters of the documentNumber to 01,02,03...

For eaxample,
rowid      Document Customer
17738      2500000229      10106
17739      2500000229      10306
17740      2500000229      10146

So in the above case, I want the end result to be :
rowid      Document Customer
17738      2501000229      10106
17739      2502000229      10306
17740      2503000229      10146

Your help will be highly appreciated.

R.

SOLUTION

Vikas Garg

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ASKER CERTIFIED SOLUTION

Zberteoc

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awking00

What is the datatype of DocumentNumber?

awking00

Also, what happens if you have a record like the following with only one Customer for a given DocumentNumber?
rowid Document Customer
17741 2500000230 10446
Should the DocumentNumber remain as is or should it be changed to 2501000230?

Rich Olu

ASKER

awking00,
document number is currently varchar but I could change it if it makes life easier.

In response to your 2nd question, if there is only 1 cust / doc# then doc# remains the same.
There are also cases where there are more than 1 doc# and the cust is also the same. In this case also, the doc# is left as is.

For example:
rowid Document Customer
17741 2500000230 10446
17742 2500000230 10446
17743 2500000230 10446

Hope this makes sense.

Thanks.

Rich Olu

ASKER

awking00,
I am still awaiting your response if there is one, otherwise let me know so I can close this question.

Thanks.

awking00

Sorry, I haven't abandoned you, but I've been extremely tied up and not had a chance to test a solution. If you come up with something that [always] works (although I'm not convinced the solutions proposed to date work in every case), please feel free to go ahead and close the question. If not, I will try to find time to work on this. :-)

Rich Olu

ASKER

Although I haven't had the chance to test this and the project focus has somewhat changed but I trust the solution provided.

Thanks.