Relational Algebra and Calculus Objective Type Questions and Answers

Questions

6 Which of the following is not a valid binary operation in the relational algebra ?

A project

B union

C set difference

D cartesian product

View Answer Comment

Answer: Option [A]

7 Relational Calculus is :

A Programming language

B Functional language

C Procedural language

D Non-procedural language

View Answer Comment

Answer: Option [D]

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8 Pick out the false statement from the following :

A The tuples within base relations corresponds to entries in the real world

B DBMS provides media recovery by restoring the database from a previous dump

C DBMS that support mandatory controls can be reffered as multilevel secure system

D None of these

View Answer Comment

Answer: Option [D]

9 Consider the join of a relation R with a relation S. If R has m tuples and S has n tuples. Then the maximum and minimum size of the join respectively are :

A m+n and 0

B m+n and [m-n]

C mn and 0

D mn and m+n

View Answer Comment

Answer: Option [C]

10 Consider P1 and P2 are formulae. Which of the following is correct ?

A P1 ∧ P2 is equlvalent to ⌈(P1V⌈(⌈P2))

B P1 ∧ P2 is equlvalent to ⌈(⌈(P1)V⌈(P2))

C P1 ∧ P2 is equlvalent to ⌈(⌈(P1)V⌈(⌈P2))

D None of the above

View Answer Comment

Answer: Option [B]

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