GATE CS 2014 Set 2 — Question 31
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Databases → Relational Model → Keys (Super, Candidate, Foreign)
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Question
The maximum number of superkeys for the relation schema
R(E, F, G, H) with as the key is _____.Correct answer
8 to 8
Solution
A superkey is any set of attributes that contains a candidate key. Here, the candidate key is .
Any subset of the relation attributes that includes is a superkey.
The set of attributes is .
Since must be present, we can choose any combination of the remaining attributes to append to .
The number of subsets of is .The superkeys are:
Any subset of the relation attributes that includes is a superkey.
The set of attributes is .
Since must be present, we can choose any combination of the remaining attributes to append to .
The number of subsets of is .The superkeys are:
1.
2.
3.
4.
5.
6.
7.
8.
Total = 8.Continue learning with Success Tracker
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