Welcome to the SQL MCQs Page

Dive deep into the fascinating world of SQL with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of SQL, a crucial aspect of DBMS. In this section, you will encounter a diverse range of MCQs that cover various aspects of SQL, 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.

Check out the MCQs below to embark on an enriching journey through SQL. 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. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

SQL MCQs | Page 20 of 38

Explore more Topics under DBMS

01

DBMS Basics

02

Data Models

03

The Entity Relationship Approach

04

Relational Databases

05

Data Storage and Querying

06

Relational Algebra

07

Normalization

08

Storage and File Structures

09

Indexing and Hashing

10

Transactions

11

Concurrency Control

12

Recovery System

13

Distributed Databases

14

Data Warehousing and Data Mining

15

RDBMS

16

Advanced SQL

17

SQL Queries,Constraints and Triggers

Q191.

Which SQL-92 standard SQL command can be used to change a table name?

RENAME TABLE

CHANGE TABLE

ALTER TABLE

None of the above is correct.

Discuss

Answer: (d).None of the above is correct.

Q192.

How can you find rows that do not match some specified condition?

EXISTS

Double use of NOT EXISTS

NOT EXISTS

None of the above is correct.

Discuss

Answer: (b).Double use of NOT EXISTS

Q193.

A regular subquery can be processed:

from the top down.

from the bottom up.

by nesting.

None of the above is correct.

Discuss

Answer: (b).from the bottom up.

Q194.

What SQL command can be used to add columns to a table?

MODIFY TABLE TableName ADD COLUMN ColumnName

MODIFY TABLE TableName ADD ColumnName

ALTER TABLE TableName ADD COLUMN ColumnName

ALTER TABLE TableName ADD ColumnName

Discuss

Answer: (d).ALTER TABLE TableName ADD ColumnName

Q195.

The EXISTS keyword will be true if:

any row in the subquery meets the condition only.

all rows in the subquery fail the condition only.

both of these two conditions are met.

neither of these two conditions is met.

Discuss

Answer: (a).any row in the subquery meets the condition only.

Q196.

Changing cardinalities in a database is:

a common database design task.

a rare database design task, but does occur.

a database design task that never occurs.

is impossible to do, so a new database must be constructed and the data moved into it.

Discuss

Answer: (a).a common database design task.

Q197.

The NOT EXISTS keyword will be true if:

any row in the subquery meets the condition.

all rows in the subquery fail the condition.

both of these two conditions are met.

neither of these two conditions is met.

Discuss

Answer: (b).all rows in the subquery fail the condition.

Q198.

To drop a column that is used as a foreign key, first:

drop the primary key.

drop the table containing the foreign key..

drop the foreign key constraint.

All of the above must be done.

Discuss

Answer: (c).drop the foreign key constraint.

Q199.

What SQL command will allow you to change the table STUDENT to add the constraint named GradeCheck that states that the values of the Grade column must be greater than 0?

ALTER TABLE STUDENT ALTER CONSTRAINT GradeCheck (Grade > 0);

ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck (Grade > 0);

ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);

None of the above is correct.

Discuss

Answer: (c).ALTER TABLE STUDENT ADD CONSTRAINT GradeCheck CHECK (Grade > 0);

Q200.

Which is not true of a correlated subquery?

EXISTS/NOT EXISTS is a form of a correlated subquery.

The processing of the SELECT statements is nested.

They can be used to verify functional dependencies.

They are very similar to a regular subquery.

Discuss

Answer: (d).They are very similar to a regular subquery.

Page 20 of 38

Welcome to the SQL MCQs Page

SQL MCQs | Page 20 of 38

Explore more Topics under DBMS

DBMS Basics

Data Models

The Entity Relationship Approach

Relational Databases

Data Storage and Querying

Relational Algebra

Normalization

Storage and File Structures

Indexing and Hashing

Transactions

Concurrency Control

Recovery System

Distributed Databases

Data Warehousing and Data Mining

RDBMS

Advanced SQL

SQL Queries,Constraints and Triggers

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