ER Model
Authored by chetna kachhwaha
Computers
11th - 12th Grade
Used 74+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Given the basic ER and relational models, which of the following is INCORRECT?
An attribute of an entity can have more than one value
An attribute of an entity can be composite
In a row of a relational table, an attribute can have more than one value
In a row of a relational table, an attribute can have exactly one value or a NULL value
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Consider the following ER diagram. The minimum number of tables needed to represent M, N, P, R1, R2 is:
2
3
4
5
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of entity cannot exist in the database unless another type of entity also exists in the database, but does not require that the identifier of that other entity be included as part of its own identifier?
Weak entity
Strong entity
ID-dependent entity
ID- independent entity
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which type of entity represents an actual occurrence of an associated generalized entity?
Supertype entity
Subtype entity
Archetype entity
Instance entity
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following refers to something that can be identified in the users' work environment, something that the users want to track?
Entity
Attribute
Identifier
Relationship
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following refers to an entity in which the identifier of one entity includes the identifier of another entity?
Weak entity
Strong entity
ID-Dependent entity
ID-independent entity
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
An attribute that names or identifies entity instances is a(n):
entity
attribute.
identifier.
relationship.
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