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GATE 2023 Database Quiz 18

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Question 1

The minimal set of super keys is called:

Question 2

Which of the following keys can be upgraded as a primary key in SQL?

Question 3Multiple Correct Options

Which of the following statements are true about primary keys and alternate keys?

Question 4

Consider a relation R (A, B, C, D, E) with the following functional dependencies:

ABC  DE

D  AB

The number of super keys of R is:

Question 5

What will be the maximum number of super keys for relation R (PQRST) with PQR as candidate key ?

Question 6

For a given relation R [A1, A2, …An] what is the number of super keys if candidate keys are

{(A1, A2), (A2 A3) } ?

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May 11GATE & PSU CS