Classical

Database MCQ - Database design

6:  

 Let R(A, B, C, D, E, P, G) be a relational schema in which the following functional dependencies are known to hold:
AB —> CD,
DE —> P,
C --> E,
P --> C and B —> G .
The relational schema R is

A.

In BCNF

B.

in 3NF, but not in BCNF

C.

In 2NF, but not in 3NF

D.

Not in 2NF

 
 

Option: D

Explanation :


7:  

Consider the following set of functional dependencies on the schema (A, B, C)
A --> BC,
B —> C,
A —> B,
AB —> C
The cannonical cover for this set is

A.

A —> BC and B ---->C

B.

A ----> BC and AB —> C

C.

A —> BC and A —> B

D.

A —> B and B —> C

 
 

Option: A

Explanation :


8:  

 A table T1 in a relation database has following rows and columns.

Roll number                       Marks.
1                                           10
2                                           20
3                                           30
4                                           NULL

The following sequence of SQL statements was successfully executed in table T1.

Update T1 set marks =marks + 5 ;

select avg(marks) from T1 ;

 What is the output of the select statement?

 

A.

18.75

B.

20

C.

25

D.

NULL

 
 

Option: A

Explanation :

Average = (15+25+35+null)/4 = 18.75


9:  

Which normal form is considered adequate for relational database design?

 

A.

2NF

B.

3NF

C.

4 NF

D.

BCNF

 
 

Option: B

Explanation :


10:  

 A functional dependency of the form x —> y is trival if

A.

⊆ x

B.

⊂  x

C.

 y

D.

y and y⊂ x

 
 

Option: A

Explanation :




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Syllabus covered in this section is-

  • E- R diagrams and their transformation, to relational design
  •  Normalization - l NF, 2NF, 3NF
  •  BCNF and 4NF.Limitations of 4NF and BCNF
  • SQL :Data Definition Language (DDL) , Data Manipulation Language (DML), Data Control Language· (DCL)-
  • Database objects like Views, indexes, sequences, synonyms, Data dictionary
  • Database Concepts
  • Data Models,
  • Design of Relational Database
  • Query Processing and Optimization
  • Centralized and Distributed Database
  •  Security.
  •  Concurrency and Recovery in Centralized and Distributed Database Systems,
  • Object Oriented Database Management
  • Systems (Concepts, Composite objects, Integration with ROBMS applications),

 

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