Classical

Database MCQ - ER-model & Relational Model

16:  

Data independence means

A.

Data is defined separately and not included in programs

B.

Programs are not dependent on the physical attributes of data.

C.

Programs are not dependent on the logical attributes of data

D.

Both (B) and (C).

 
 

Option: D

Explanation :


17:  

E-R model uses this symbol to represent weak entity set ?

A.

Dotted rectangle

B.

Diamond

C.

Doubly outlined rectangle

D.

None of these

 
 

Option: C

Explanation :


18:  

SET concept is used in :

A.

Network Model

B.

Hierarchical Model

C.

Relational Model

D.

None of these

 
 

Option: A

Explanation :


19:  

Relational Algebra is

A.

Data Definition Language

B.

Meta Language

C.

Procedural query Language

D.

None of the above

 
 

Option: C

Explanation :


20:  

 Key to represent relationship between tables is called

A.

Primary key

B.

Secondary Key

C.

Foreign Key

D.

None of these

 
 

Option: C

Explanation :




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