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liz
<I>Instead I'd create a SQL script that has the ALTER TABLE statements so that it can be checked, and that the update operation is run in a controlled manner.</I>
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I'm going for ease of use, so any changes would be "automatic" (with maybe the option of <B>not</B> deleting columns automatically). But there would be an API to get at the primitives, so that you can indeed do what you propose.
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Liz
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