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.

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 9 of 17

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Advanced SQL

Q81.

The problem of ordering the update in multiple update is avoided using

Set

Where

Case

When

Discuss

Answer: (c).Case

Q82.

Which of the following is the correct format for case statements.

CASE
WHEN pred1 ... result1
WHEN pred2 ... result2
. . .
WHEN predn ... resultn
ELSE result0
END

CASE
WHEN pred1 THEN result1
WHEN pred2 THEN result2
. . .
WHEN predn THEN resultn
ELSE result0
END

CASE
WHEN pred1 THEN result1
WHEN pred2 THEN result2
. . .
WHEN predn THEN resultn
ELSE result0

All of the mentioned

Discuss

Answer: (b).CASE
WHEN pred1 THEN result1
WHEN pred2 THEN result2
. . .
WHEN predn THEN resultn
ELSE result0
END

Q83.

Which of the following relation updates all instructors with salary over $100,000 receive a 3 percent raise, whereas all others receive a 5 percent raise.

UPDATE instructor
SET salary = salary * 1.03
WHERE salary > 100000;
UPDATE instructor
SET salary = salary * 1.05
WHERE salary <= 100000;

UPDATE instructor
SET salary = salary * 1.05
WHERE salary < (SELECT avg (salary)
FROM instructor);

UPDATE instructor
SET salary = CASE
WHEN salary <= 100000 THEN salary * 1.05
ELSE salary * 1.03
END

Both a and c

Discuss

Answer: (d).Both a and c

Q84.

SELECT *
FROM student JOIN takes USING (ID);

The above query is equivalent to

SELECT *
FROM student INNER JOIN takes USING (ID);

SELECT *
FROM student OUTER JOIN takes USING (ID);

SELECT *
FROM student LEFT OUTER JOIN takes USING (ID);

NONE OF the mentioned

Discuss

Answer: (a).SELECT *
FROM student INNER JOIN takes USING (ID);

Q85.

In SQL the statement select * from R, S is equivalent to

Select * from R natural join S

Select * from R cross join S

Select * from R union join S

Select * from R inner join S

Discuss

Answer: (b).Select * from R cross join S

Q86.

Here the tuples are selected from the view.Which one denotes the view.

SELECT course_id
FROM physics_fall_2009
WHERE building= ’Watson’;

Course_id

Watson

Building

physics_fall_2009

Discuss

Answer: (c).Building

Q87.

For the view Create view instructor_info as

SELECT ID, name, building
FROM instructor, department
WHERE instructor.dept name= department.dept name;

If we insert tuple into the view as insert into instructor info values (’69987’, ’White’, ’Taylor’);

What will be the values of the other attributes in instructor and department relations?

Default value

Null

Error statement

Discuss

Answer: (b).Null

Q88.

Find the error in this query .

CREATE VIEW faculty AS
    SELECT ID, name, dept name
    FROM instructor;

Instructor

Select

View …as

None of the mentioned

Discuss

Answer: (d).None of the mentioned

Q89.

A _________ consists of a sequence of query and/or update statements.

Transaction

Commit

Rollback

Flashback

Discuss

Answer: (a).Transaction

Q90.

Which of the following makes the transaction permanent in the database ?

View

Commit

Rollback

Flashback

Discuss

Answer: (b).Commit

Page 9 of 17

Welcome to the SQL Queries,Constraints and Triggers MCQs Page

SQL Queries,Constraints and Triggers MCQs | Page 9 of 17

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

SQL

Data Warehousing and Data Mining

RDBMS

Advanced SQL

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