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Consider a relational schema S = (U, V, W, X, Y, Z) on which the following functional dependencies hold:
{U → V, VW → X, Y → W, X → U}
Which are the candidate keys among following options?
  • a)
    UY, VY
  • b)
    UY, VY, XY
  • c)
    UYZ, VYZ, VWZ
  • d)
    UYZ, VYZ, XYZ
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider a relational schema S = (U, V, W, X, Y, Z) on which the follo...
Can you please provide the functional dependencies that hold for the given relational schema S?
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Community Answer
Consider a relational schema S = (U, V, W, X, Y, Z) on which the follo...
Concept:
A candidate key is a column, or set of columns, in a table that can uniquely identify any database record without referring to any other data
The following functional dependencies,
U → V, VW → X, Y → W, X → U
S = (U, V, W, X, Y, Z)
Here YZ is an independent key. So, for every key, the YZ should their. Hence only option 4 is containing YZ for all keys.
∴ Hence the correct answer is UYZ, VYZ, XYZ.
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Consider a relational schema S = (U, V, W, X, Y, Z) on which the following functional dependencies hold:{U → V, VW → X, Y → W, X → U}Which are the candidate keys among following options?a)UY, VYb)UY, VY, XYc)UYZ, VYZ, VWZd)UYZ, VYZ, XYZCorrect answer is option 'D'. Can you explain this answer?
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