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Can I create a JOIN which uses two different keys depending on a field in the file?

Can I create a JOIN which uses two different keys depending on a field in the file?

Can I create a JOIN which uses two different keys depending on a field in the file?

(OP)
I have a file which contains records of invoices from two different sources. One of the sources has a field for the year that the product invoiced was created, and the other one has that field blank.

I want to join this file to another one, using a key that includes the year if the invoice number is less than 5000000 and using another key that does not include the year if the invoice number is greater than 5000000.

Since I got error messages when I tried to put an IF into the Join statement, I am using one join to create a workfile, and then another join to create another workfile, then combining the workfiles.

This works, but it takes a long time to run. Does anyone have any other ideas on how to do this?

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