Question
1
Which of the following concept is
not part of ER modeling.
Select one:
degree
of a relationship
partial
key
primary
key
weak
entity type
Feedback
The correct answer is: primary key
Question
2
SQL is a procedural query language
for Relational model.
Select one:
True
False
Feedback
The correct answer is 'False'.
Question
3
In ER modeling, which of the
following is not correct?
Select one:
Weak
entity types are represented by double rectangles
Weak
entity types always have total participation
A
weak entity type can have a multivalued attribute.
A
weak entity type and its owner entity type can heve many-to-many relationship.
Feedback
The correct answer is: A weak entity
type and its owner entity type can heve many-to-many relationship.
Question
4
The number of columns or attributes
of a relation is known as the cardinality of that relation.
Select one:
True
False
Feedback
The correct answer is 'False'.
Question
5
Assume that we have two tables EMP
and DEPT. Now when we execute the SQL query-
SELECT * FROM EMP, DEPT;
which of the following is correct?
Select one:
Shows
SQL error since no join condition in WHERE clause
Always
gives zero tuples in the result
Result
will have EMP tuples joined with DEPT table if some join condition is
met.
It
is Cartesian product of EMP and DEPT
Feedback
The correct answer is: It is
Cartesian product of EMP and DEPT
Question
6
Which of the following is not a
representational or implementation data model?
Select one:
Relational
model
Object
model
ER
model
Object
relational model
Feedback
The correct answer is: ER model
Question
7
Ordering of tuples is not
significant in a relation.
Select one:
True
False
Feedback
The correct answer is 'True'.
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