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1NF =====( 2NF. Eliminate partial functional dependency. For example, X is fully functionally dependent on Y1 in relation Y1Y2X (Y1, Y2, X) FFD: Y1 → X. which means that X is partially functionally dependent on Y1, Y2(compound key) PFD: Y1, Y2 → X. As a result, Y1, Y2 and X can be normalized into 2NF as follows: Relation Y1Y2 (*Y1, Y2) ................
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