Classical

Database MCQ - ER-model & Relational Model

36:  

Which of the operations constitute a basic set of operations for manipulating relational data?

A.

Predicate calculus

B.

Relational calculus

C.

Relational algebra

D.

None of the above

 
 

Option: C

Explanation :


37:  

Which of the following is another name for weak entity?

A.

Child

B.

Owner

C.

Dominant

D.

All of the above

 
 

Option: A

Explanation :


38:  

Which of the following database object does not physically exist?

A.

Base table

B.

Index

C.

View

D.

None of the above

 
 

Option: C

Explanation :


39:  

NULL is

A.

The same as 0 for integer

B.

The same as blank for character

C.

The same as 0 for integer and blank for character

D.

Not a value

 
 

Option: D

Explanation :


40:  

 Which of the following is record based logical model?

A.

Network Model

B.

Object oriented model

C.

E-R Model

D.

None of these

 
 

Option: A

Explanation :




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