Given a relational schema r(A, B, C, D), does A BC logically imply A B
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Given a relational schema r(A, B, C, D), does A →→ BC logically imply A →→ B and A →→ C? If yes prove it, or else give a counter example.
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Given a relation r ABCD A BC means attributes B and ...View the full answer
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Related Book For
Database System Concepts
ISBN: 9780078022159
7th Edition
Authors: Abraham Silberschatz, Henry F. Korth, S. Sudarshan
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