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I have gotten the following task in an assignment:

In the following tasks assume the relation R(A, B, C, D, E) with the following functional dependencies:

AB → C, BC → D, CD → A, E → D

Solve the following tasks: List all keys of R and explain why there can be no other.

How do I find the keys in this?

marc_s
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    Possible duplicate of [Determine Keys from Functional Dependencies](http://stackoverflow.com/questions/5735592/determine-keys-from-functional-dependencies) – Thilo Apr 26 '17 at 08:52
  • I have seen that, but I didn't get it. –  Apr 26 '17 at 08:55
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    Try to leave a comment on the other question. Also clarify what exactly was unclear in the answer over there. – Thilo Apr 26 '17 at 09:13
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    You could also look at this question: [How to find a candidate key](http://stackoverflow.com/questions/43465696/how-to-find-a-candidate-key). – Renzo Apr 26 '17 at 10:22

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