- 2 In The Following We Use A B C And D Denote The Attributes Of Relations Please Prove The Following Rules Based On 1 (17.82 KiB) Viewed 29 times
2. In the following, we use A, B, C and D denote the attributes of relations. Please prove the following rules based on
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2. In the following, we use A, B, C and D denote the attributes of relations. Please prove the following rules based on
2. In the following, we use A, B, C and D denote the attributes of relations. Please prove the following rules based on Armstrong axioms. (6 points) (1) If A→B holds and A→C holds, then A→BC holds. Answer: (2) If A→BC holds, then A→B and A → C hold. Answer: (3) If A → B holds and BCD hold, then AC → D holds. Answer:
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