SQL is selected based on run-time server. Generated IDE code (C #, etc.) Does not depend on version. No, you do not need to do anything to reassign another version of the database.
However, if you try it, some code can not be compared with SQL2000. It is simply impossible (at least, it is convenient or safe) to take some action skip / take / etc without reasonable support database. Some things he can do ... Some things can not. You will need integration - test the application for this platform.
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