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Consider a relation with seven attributes ABCDEGH. The following dependencies are given .
AB -> C, AC -> B, AD -> E, B -> D, BC -> A, E -> G.
What is the key ?
  • a)
    ACE
  • b)
    ACH
  • c)
    ACEH
  • d)
    cannot be identified.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider a relation with seven attributes ABCDEGH. The following depen...
AC -> B           So, (AC)+ = {A,C, B,}
B -> D               (AC)+ = {A,C, B, D}
AD -> E             (AC)+ = {A,C, B, D, E}
E -> G                (AC)+ = {A,C, B, D, E, G}
So to get H we have to include H into (AC)
So the key is ACH.
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Most Upvoted Answer
Consider a relation with seven attributes ABCDEGH. The following depen...
This means that attribute B is functionally dependent on attribute A. In other words, for every value of A, there is only one corresponding value of B.
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