Classical

Database MCQ - Database design

6:  

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 :

Sets of functional dependencies may have redundant dependencies that can be inferred from the other functional dependencies. A canonical cover of F is a “minimal” set of functional dependencies equivalent to F, having no redundant dependencies or redundant parts of dependencies.

As we can infer all FD's from option A , so A is right answer.

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7:  

 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

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kiran said: (6:45pm on Sunday 12th May 2013)
5 in each marks then calculate and find its average
mubina said: (6:44pm on Thursday 27th June 2013)
null is updated but the average calculated on (15 25 35)/3 so it wwill give output 25

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8:  

Which normal form is considered adequate for relational database design?

 

A.

2NF

B.

3NF

C.

4 NF

D.

BCNF

 
 

Option: B

Explanation :

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9:  

 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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10:  

If every non-key attribute is functionally depedent primary key, then the relation will be in

A.

First normal form

B.

Second normal form

C.

Third form

D.

Fourth normal form

 
 

Option: B

Explanation :

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Amit said: (4:15pm on Friday 6th September 2013)
in 2nf partial dependency should not exist den how it can be 2nf
Atul said: (12:56am on Thursday 12th January 2017)
I think it should be A. First normal form , i.e for 2nf there would be FULLY functionally dependent..

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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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