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The following questions (2 and 3) refer to the relational scheme: R (A, B, C, D, E , F, G, H) and the following functional
The following questions (2 and 3) refer to the relational scheme: R (A, B, C, D, E , F, G, H) and the following functional dependencies over R:
A BCD
AD E
EFG H
F GH
2. Based on the functional dependencies, there is one key for R. What is it, why?
3. One of the four functional dependencies can be removed without altering the key. Which one, why?
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