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DBMS GATE MCQ Questions and Answers
1. In the section relation which of the following is used as a foreign key?
a) Course_id
b) Course_id,sec_id
c) Room_number
d) Course_id,sec_id,room_number
Answer: a
2. In order to include an attribute Name to the teaches relation which of the following command is used?
a) Alter table teaches include Name;
b) Alter table teaches add Name;
c) Alter table teaches add Name varchar;
d) Alter table teaches add Name varchar(20);
Answer: d
3. To replace the relation section with some other relation the initial step to be carried out is
a) Delete section;
b) Drop section;
c) Delete from section;
d) Replace section new_table ;
Answer: b
4. Which of the following command is used to display the departments of the instructor relation?
a) Select * from instructor where Dept_name = Finance;
b) Select * from instructor ;
c) Select dept_name from instructor;
d) Select dept_name for instructor where Name=Jackson;
Answer: c
5. How can we select the elements which have common Dept_name in both the relation ?
a) Select * from instructor i , course c where i.Dept_name=c.Dept_name;
b) Select Dept name from instructor ,Course ;
c) Select * from instructor i , course c ;
d) Select Dept_name from instructor where Dept_name = NULL;
Answer: a
6. If a person all the people in Music department gets fired which of the following has to be performed on the instructor relation?
a) Delete Dept_name=Music in instructor;
b) Delete from instructor where Dept_name=Music;
c) Remove Dept_name= Music
d) All of the mentioned
Answer: b
7. Which function is used to find the count of distinct departments?
a) Dist
b) Distinct
c) Count
d) Count,Dist
Answer: a
8. Which function is used to identify the title with Least scope?
a) Min(Credits)
b) Max(Credits)
c) Min(title)
d) Min(Salary)
Answer: a
9. A domain is ______ if elements of the domain are considered to be indivisible units.
a) Atomic
b) Subatomic
c) Substructure
d) Subset
Answer: a
10. Identify the composite attributes
a) Salary
b) Credits
c) Section_id
d) None of the mentioned
Answer: d
11. Which one is based on multi-valued dependency:
a) First
b) Second
c) Third
d) Fourth
Answer: d
12. If a relation is in BCNF, then it is also in
a) 1 NF
b) 2 NF
c) 3 NF
d) All of the mentioned
Answer: d
13. If every non-key attribute is functionally dependent primary key, then the relation will be in
a) First normal form
b) Second normal form
c) Third form
d) Fourth normal form
Answer: b
14. If an attribute of a composite key is dependent on an attribute of the other composite key, a normalization called _____ is needed.
a) DKNF
b) BCNF
c) Fourth
d) Third
Answer: b
15. The term for information that describes what type of data is available in a database is:
a) Data dictionary
b) data repository
c) Index data
d) Metadata
Answer: d
16. A data type that creates unique numbers for key columns in Microsoft Access is:
a) Autonumber
b) Boolean
c) Sequential key
d) Sequential number
Answer: a
17. A dependency exist between two columns when
a) Together they constitute a composite key for the table
b) Knowing the value in one column determines the value stored in another column
c) The table is in 3NF
d) Together they constitute a foreign key
Answer: a
18. In the __________ normal form, a composite attribute is converted to individual attributes.
a) First
b) Second
c) Third
d) Fourth
Answer: a
19. A table on the many side of a one to many or many to many relationship must:
a) Be in Second Normal Form (2NF)
b) Be in Third Normal Form (3NF)
c) Have a single attribute key
d) Have a composite key
Answer: d
20. Tables in second normal form (2NF):
a) Eliminate all hidden dependencies
b) Eliminate the possibility of a insertion anomalies
c) Have a composite key
d) Have all non key fields depend on the whole primary key
Answer: a
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