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Welcome to the SQL Queries,Constraints and Triggers MCQs Page

Dive deep into the fascinating world of SQL Queries,Constraints and Triggers with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of SQL Queries,Constraints and Triggers, a crucial aspect of DBMS. In this section, you will encounter a diverse range of MCQs that cover various aspects of SQL Queries,Constraints and Triggers, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within DBMS.

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Check out the MCQs below to embark on an enriching journey through SQL Queries,Constraints and Triggers. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of DBMS.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of SQL Queries,Constraints and Triggers. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

SQL Queries,Constraints and Triggers MCQs | Page 2 of 17

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Q11.
Which one of the following is used to define the structure of the relation ,deleting relations and relating schemas ?

a.

DML(Data Manipulation Langauge)

b.

DDL(Data Definition Langauge)

c.

Query

d.

Relational Schema

Discuss
Answer: (b).DDL(Data Definition Langauge)
Q12.
Which one of the following provides the ability to query information from the database and to insert tuples into, delete tuples from, and modify tuples in the database ?

a.

DML(Data Manipulation Langauge)

b.

DDL(Data Definition Langauge)

c.

Query

d.

Relational Schema

Discuss
Answer: (a).DML(Data Manipulation Langauge)
Q13.
Create table employee (name varchar ,id integer)
What type of statement is this ?

a.

DML

b.

DDL

c.

View

d.

Integrity constraint

Discuss
Answer: (b).DDL
Q14.
Select * from employee
What type of statement is this?

a.

DML

b.

DDL

c.

View

d.

Integrity constraint

Discuss
Answer: (a).DML
Q15.
The basic data type char(n) is a _____ length character string and varchar(n) is _____ length character.

a.

Fixed, equal

b.

Equal, variable

c.

Fixed, variable

d.

Variable, equal

Discuss
Answer: (c).Fixed, variable
Q16.
An attribute A of datatype varchar(20) has the value “Avi” . The attribute B of datatype char(20) has value ”Reed” .Here attribute A has ____ spaces and attribute B has ____ spaces.

a.

3, 20

b.

20, 4

c.

20 , 20

d.

3, 4

Discuss
Answer: (a).3, 20
Q17.
To remove a relation from an SQL database, we use the ______ command.

a.

Delete

b.

Purge

c.

Remove

d.

Drop table

Discuss
Answer: (d).Drop table
Q18.
Delete from r; r – relation
This command performs which of the following action ?

a.

Remove relation

b.

Clear relation entries

c.

Delete fields

d.

Delete rows

Discuss
Answer: (b).Clear relation entries
Q19.
Insert into instructor values (10211, ’Smith’, ’Biology’, 66000);
What type of statement is this ?

a.

Query

b.

DML

c.

Relational

d.

DDL

Discuss
Answer: (b).DML
Q20.
Updates that violate __________ are disallowed.

a.

Integrity constraints

b.

Transaction control

c.

Authorization

d.

DDL constraints

Discuss
Answer: (a).Integrity constraints
Page 2 of 17

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