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 7 of 17

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Advanced SQL

Q61.

If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.

SELECT COUNT (____ ID)
FROM teaches
WHERE semester = ’Spring’ AND YEAR = 2010;

Distinct

Count

Avg

Primary key

Discuss

Answer: (a).Distinct

Q62.

A Boolean data type that can take values true, false, and________

Null

Unknown

Discuss

Answer: (d).Unknown

Q63.

Which of the following should be used to find all the courses taught in the Fall 2009 semester but not in the Spring 2010 semester .

SELECT DISTINCT course id
FROM SECTION
WHERE semester = ’Fall’ AND YEAR= 2009 AND
course id NOT IN (SELECT course id
FROM SECTION
WHERE semester = ’Spring’ AND YEAR= 2010);

SELECT DISTINCT course_id
FROM instructor
WHERE name NOT IN (’Fall’, ’Spring’);

(SELECT course id
FROM SECTION
WHERE semester = ’Spring’ AND YEAR= 2010)

SELECT COUNT (DISTINCT ID)
FROM takes
WHERE (course id, sec id, semester, YEAR) IN (SELECT course id, sec id, semester, YEAR
FROM teaches
WHERE teaches.ID= 10101);

Discuss

Answer: (a).SELECT DISTINCT course id
FROM SECTION
WHERE semester = ’Fall’ AND YEAR= 2009 AND
course id NOT IN (SELECT course id
FROM SECTION
WHERE semester = ’Spring’ AND YEAR= 2010);

Q64.

The phrase “greater than at least one” is represented in SQL by _____

< all

< some

> all

> some

Discuss

Answer: (d).> some

Q65.

Which of the following is used to find all courses taught in both the Fall 2009 semester and in the Spring 2010 semester .

SELECT course id
FROM SECTION AS S
WHERE semester = ’Fall’ AND YEAR= 2009 AND
EXISTS (SELECT *
FROM SECTION AS T
WHERE semester = ’Spring’ AND YEAR= 2010 AND
S.course id= T.course id);

SELECT name
FROM instructor
WHERE salary > SOME (SELECT salary
FROM instructor
WHERE dept name = ’Biology’);

SELECT COUNT (DISTINCT ID)
FROM takes
WHERE (course id, sec id, semester, YEAR) IN (SELECT course id, sec id, semester, YEAR
FROM teaches
WHERE teaches.ID= 10101);

(SELECT course id
FROM SECTION
WHERE semester = ’Spring’ AND YEAR= 2010)

Discuss

Answer: (a).SELECT course id
FROM SECTION AS S
WHERE semester = ’Fall’ AND YEAR= 2009 AND
EXISTS (SELECT *
FROM SECTION AS T
WHERE semester = ’Spring’ AND YEAR= 2010 AND
S.course id= T.course id);

Q66.

This statement is erroneous because

SELECT dept_name, ID, avg (salary)
FROM instructor
GROUP BY dept_name;

Avg(salary) should not be selected

Dept_id should not be used in group by clause

Misplaced group by clause

Group by clause is not valid in this query

Discuss

Answer: (b).Dept_id should not be used in group by clause

Q67.

SQL applies predicates in the _______ clause after groups have been formed, so aggregate functions may be used.

Group by

With

Where

Having

Discuss

Answer: (b).With

Q68.

Aggregate functions can be used in the select list or the_______clause of a select statement or subquery. They cannot be used in a ______ clause.

Where, having

Having, where

Group by, having

Group by, where

Discuss

Answer: (b).Having, where

Q69.

The ________ keyword is used to access attributes of preceding tables or subqueries in the from clause.

Lateral

Having

With

Discuss

Answer: (b).Lateral

Q70.

Which of the following creates temporary relation for the query on which it is defined ?

With

From

Where

Select

Discuss

Answer: (a).With

Page 7 of 17

Welcome to the SQL Queries,Constraints and Triggers MCQs Page

SQL Queries,Constraints and Triggers MCQs | Page 7 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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