All instances of given entity is………
a) have same values of attributes
b) belong to same entity
c) have the same attributes
d) both b & c
An identifier of an entity instance ………
a) may be unique
b) must be unique
c) more than one attribute
d) both a & c
Which type of identifier is used to identify a set of instances of given entity?
a) unique
b) non-unique
c) instance
d) none of these
Depending on the system being modeled, a relationship can have Entities.
a) one
b) two
c) three
d) all of these
The degree of relationship refers to as…
a) number of entities
b) maximum cardinality
c) minimum cardinality
d) number of attributes
What is weak entity in which?
a) not relationship with any other entities
b) does not have unique identifier
c) cannot exist in database
d) is a subtype
