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Generating a random string in Sql server

If I have 300 users in my database, and I need to assign each one a random Id,
how can I do this using SQL server. I don't want to use GUIDs because I think that is kind of over kill.

I would like the ID to be 4 characters long. I can query the database to find out if the id already exists, and if it does, I just run the random id sql code again, until I get a unique id.
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