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
The representation of real world objects, events, their associations is called….
a) database
b) data segment
c) data model
d) none of these
How many types of record-base data model?
a) one
b) two
c) three
d) four
Explanation: hierarchical model, network model, relational model
Which of the following data models stores data in table structures and perform various operations on table row and column?
a) hierarchical
b) network
c) relational model
d) object
