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Find the titles of courses in the Comp. Sci. department that have 3 credits.

computer scince


Q1:Write the following queries in relational algebra, using the university schema (chapter6):

  1. a) Find the titles of courses in the Comp. Sci. department that have 3 credits.
  2. b) Find the highest salary of any instructor.


Q.2. Let the following relation schemas be given:


R = (A, B,C) and S = (D, E, F)

Let relations r(R) and s(S) be given. Give an expression in the tuple relational calculus that is equivalent to each of the following:

  1. a) ∏A(r )
  2. b) σB =17 (r )


Q3: Use Armstrong’s axioms to prove the soundness of the pseudo transitivity rule.

If α → β and γ β → δ, then α γ → δ.

(1 Mark)


Q.4. Compute the closure of the following set F of functional dependencies for relation schema r (A, B, C, D, E).






(NOTE: list at least 6 members of F+)


Q5. Find candidate keys for the relation R(ABCD) having following FD’s





Silberschatz, A., Korth, F., & Sudarshan, S. Database system concepts (6th Ed.).New York: McGraw Hill, 2010.  ISBN # ISBN 0-07-352332-1


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