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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.

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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 1 of 38

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Q1.
The SQL database language includes statements for:
Discuss
Answer: (d).All of the above.
Q2.
A command to remove a relation from an SQL database
Discuss
Answer: (b).Drop table table name
Q3.
Which SQL Query is use to remove a table and all its data from the database?
Discuss
Answer: (c).Drop Table
Q4.
A type of query that is placed within a WHERE or HAVING clause of another query is called
Discuss
Answer: (b).Sub query
Q5.
Aggregate functions are functions that take a ___________ as input and return a single value.
Discuss
Answer: (a).Collection of values
Q6.
Select __________ from instructor where dept name= ’Comp. Sci.’;
Which of the following should be used to find the mean of the salary ?
Discuss
Answer: (b).Avg(salary)
Q7.
All aggregate functions except _____ ignore null values in their input collection.
Discuss
Answer: (b).Count(*)
Q8.
A Boolean data type that can take values true, false, and________ .
Discuss
Answer: (d).Unknown
Q9.
Select count (____ ID)
from teaches
where semester = ’Spring’ and year = 2010;
If we do want to eliminate duplicates, we use the keyword ______in the aggregate expression.
Discuss
Answer: (a).Distinct
Q10.
The ____ connective tests for set membership, where the set is a collection of values produced by a select clause. The ____ connective tests for the absence of set membership.
Discuss
Answer: (c).In, not in

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