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Fundamentals of Databases assignment

Q.1. Define the following terms:
a) Relational algebra
b) Domain relational calculus
(0.5 Marks)
Q.2. Write the following queries in relational algebra, using the university schema (chapter6):
a) Find the titles of courses in the Comp. Sci. department that have 3 credits.
b) Find the highest salary of any instructor.
(0.5 Marks)
Q.3. 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:
a)  A(r )
b)  B =17 (r )
(0.5 Marks)
Q.4. 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.5. Compute the closure of the following set F of functional dependencies for relation schema r
(A, B, C, D, E).
A→BC
CD→E
B→D
E→A
(NOTE: list at least 6 members of F+)
(1 Mark)
Q.6. List two benefits of normalization
(0.5 Marks)
Q.7. Find candidate keys for the relation R(ABCD) having following FD’s
AB→CD, C→A, D→A
(1 Mark)

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Category: Sample Questions