Q. Suppose relation R(A,B) currently has tuples {(1,2), (1,3), (3,4)} and relation S(B,C) currently has {(2,5), (4,6), (7,8)}. Then the number of tuples in the result of the SQL query:

SELECT *
FROM R NATURAL OUTER JOIN S;

View solution

Q. Suppose now that R(A,B) and S(A,B) are two relations with r and s tuples, respectively (again, not necessarily distinct). If m is the number of (not necessarily distinct) tuples in the result of the SQL query:

R intersect S;

Then which of the following is the most restrictive, correct condition on the value of m?

View solution

Q. Suppose relation R(A,B,C,D,E) has the following functional dependencies:
A -> B

B -> C

BC -> A

A -> D

E -> A

D -> E

Which of the following is not a key?

View solution

Q. The normal form which satisfies multivalued dependencies and which is in BCNF is

View solution

Q. Which of the following is a tuple-generating dependencies ?

View solution

Q. The main task carried out in the __________ is to remove repeating attributes to separate tables.

View solution

Q. Which of the normal form is based on multivalued dependencies ?

View solution

Q. Which forms has a relation that possesses data about an individual entity?

View solution

Q. If a multivalued dependency holds and is not implied by the corresponding functional dependency, it usually arises from one of the following sources.

View solution

Q. Which of the following has each related entity set has its own schema and there is an additional schema for the relationship set?

View solution

Q. In which of the following , a separate schema is created consisting of that attribute and the primary key of the entity set.

View solution

Q. Fifth Normal form is concerned with

View solution

Q. In 2NF

View solution

Q. _____________ can help us detect poor E-R design.

View solution

Q. Which of the following has each related entity set has its own schema and there is an additional schema for the relationship set.

View solution

Q. Suppose the user finds the usage of room number and phone number in a relational schema there is confusion.This is reduced by

View solution

Q. What is the best way to represent the attributes in a large database?

View solution

Q. Designers use which of the following to tune performance of systems to support time-critical operations?

View solution

Q. In the schema (dept name, size) we have relations total inst 2007, total inst 2008 . Which dependency have lead to this relation ?

View solution

Q. Relation dept year(dept name, total inst 2007, total inst 2008, total inst 2009) .Here the only functional dependencies are from dept name to the other attributes .This relation is in

View solution