SQL MCQs: Sharpen Your Database Management Skills

Last updated by Naina Batra on Aug 30, 2024 at 05:50 PM | Reading time: 15 minutes

The ability to efficiently and securely manage large datasets is crucial for organizational success. As a result, there is a significant demand for software developers proficient in database management, particularly those skilled in SQL. With job opportunities for software developers expected to grow by 25%, competition for positions at top tech companies has never been fiercer.

What is SQL?

SQL is a computer language designed for storing and processing relational databases. The language was created by a computer scientist at IBM in the 1970s. SQL or Structured Query Language helps to access and alter databases.

SQL queries help the candidate generate, retrieve, update, delete, and modify data in databases (PostgreSQL, Oracle, MySQL). In other words, SQL is a query language that helps users to interact with databases.

SQL MCQs with Answers

SQL MCQs are widely asked in interviews to land a good job in top-tech companies for positions in database management. These SQL interview questions help the hiring team to analyze the knowledge of the candidate within a shorter duration and effort. Thus, these questions can assess your in-depth knowledge.

Hence, you must prepare yourself well enough for SQL MCQs to crack the interview. SQL for beginners seems quite tough as they find challenges in solving the questions. Here are some of the most asked SQL MCQs for your reference to improve your preparation.

1. and are the TCL commands.

GRANT and TRUNCATE
SELECT and INSERT
UPDATE and TRUNCATE
ROLLBACK and SAVEPOINT

Answer: d. ROLLBACK and SAVEPOINT

2. Choose the SQL keyword used to retrieve a maximum value.

UPPER
TOP
MAX
None of the above

Answer: c. MAX

3. _________ is not a DDL command.

ALTER
UPDATE
DROP
TRUNCATE

Answer: b. UPDATE

4. Choose the correct purpose of the SQL AS clause.

AS clause determines a search condition
AS is used with only the JOIN clause
AS SQL clause aids in changing column name in the result or assigning a name to a derived column
All of the above

Answer: c. AS SQL clause aids in changing column name in the result or assigning a name to a derived column

5. Choose the right functionalities performed on a database via SQL.

DELETE data from tables
Correct or Delete a Database
Create Views in the database
All of the above

Answer: d. All of the above

6. Common RDBMS in use are:

HeidiSQL
MySQL
Oracle
All of the above

Answer: All of the above

7. Choose the invalid SQL type.

CHARACTER
DECIMAL
FLOAT
NUMERIC

Answer: b. DECIMAL

8. Match the following:

	List 1		List 2
1	DDL	i.	Natural Difference
2	Binary operations	ii.	ALTER
3	TCL	iii.	COMMIT
4	DML	iv.	LOCK BOOK

1-i, 2-iv, 3-iii, 4-ii
1-ii, 2-i, 3-iii, 4-iv
1-i, 2-ii, 3-iii, 4-iv
1-iii, 2-i, 3-ii, 4-iv

Answer: b. 1-ii, 2-i, 3-iii, 4-iv

9. _______ is used to alter or modify table structure.

ALTER
COMMIT
CREATE
DROP

Answer: a. ALTER

10. Which symbol is used to see every column of a table?

--
/
*
!

Answer: c. *

11. _____ portrays three basic SQL DML commands.

Insert, Update, Delete
Alter, Insert, Delete
Drop, Update, Delete
Update, Drop, Insert

Answer: a. Insert, Update, Delete

12. SELECT operation in SQL is equivalent to

The projection operation in relational algebra (except that SELECT in SQL retains duplicates)
The selection operation is a relational algebra
The projection operation is a relational algebra
The selection operation s is relational algebra (except that SELECT in SQL retains duplicates)

Answer: a. The projection operation in relational algebra (except that SELECT in SQL retains duplicates)

13. ________ SQL command is used to modify the attribute value of one more selected type.

UPDATE
INSERT
DROP
MODIFY

Answer: a. UPDATE

14. Choose the right command to generate a new table in SQL.

GENERATE TABLE
BUILD TABLE
CREATE TABLE
None of the above

Answer: c. CREATE TABLE

15. BLOB in SQL stands for?

Binary Language for Objects
Binary Large Objects
Big Large Objects
None of the above

Answer: b. Binary Large Objects

16. What will be the result when no value is inserted in an ENUM list?

The code will crash
The code will get deleted
A blank value gets inserted in that case
Nothing happens

Answer: c. A blank value gets inserted in that case

17. ______ command is used to delete all rows and free up space from a table.

DROP
DELETE
ALTER
TRUNCATE

Answer: d. TRUNCATE

18. and _ commands are a part of the Data Control Language (DCL).

Revoke, Grant
Insert, Grant
DELETE, Revoke
Revoke, DEFAULT

Answer: a. Revoke, Grant

19. CRUD is the acronym for

Concatenate, Retrieve, Union, Drop
Columns, Row, Update, Drop
Create, Read, Update, Delete
Copy, Run, Update, Display

Answer: c. Create, Read, Update, Delete

20. What is the role of the MIN function in SQL?

It retrieves the minimum value in a column
It calculates the average value of a column
It calculates the sum of values in the column
It alters the maximum value in a row

Answer: a. It retrieves the minimum value in a column

21. Rows of a relation are known as

Entity
Tuple
Degree
None of the above

Answer: Tuple

22. DDL stands for

Data Definition Language
Data Depletion Language
Data Deletion Language
None of the above

Answer: Data Definition Language

23. The rows of a relation are called

Tuple
Entity
Degree
Commit

Answer: a. Tuple

24. Choose the correct order in SQL.

SELECT, WHERE, HAVING, GROUP BY
SELECT, GROUP BY, HAVING, WHERE
SELECT, HAVING, WHERE, GROUP BY
SELECT, WHERE, GROUP BY, HAVING

Answer: d. SELECT, WHERE, GROUP BY, HAVING

25. ______ command in SQL is used to retrieve data from a database.

RETRIEVE
SEARCH
FIND
SELECT

Answer: d. SELECT

26. _______ are types of Unicode character string types.

ntext
nchar
nbar
Both a and b

Answer: d. Both a and b.

27. _________ enables to identify a tuple uniquely.

Domain
Schema
Super Key.
Attribute

Answer: c. Super Key

28. The command to remove rows from a table ‘CUSTOMER’ is ___________.

DROP FROM CUSTOMER….
UPDATE FROM CUSTOMER…
REMOVE FROM CUSTOMER…
DELETE FROM CUSTOMER WHERE….

Answer: d. DELETE FROM CUSTOMER WHERE….

29. Which one of the following is not a data type in SQL?

Numeric Data Type
Date and time Data Type
String Data Type
Manipulate Data Type

Answer: d. Manipulate Data Type

30. ________ is NOT a type of constraint in SQL language.

ALTERNATE KEY
UNIQUE
FOREIGN KEY
PRIMARY KEY

Answer: a. ALTERNATE KEY

31. Which one of the following is not a category of SQL command?

DDL
TCL
DCL
SCL

Answer: d. SCL

32. ________ is not a SQL command.

WHERE
DELETE
ORDER
SELECT

Answer: a. DELETE

33. Which of the following is not an SQL query?

SQL SELECT IN
SQL UPDATE Statement
SQL INSERT INTO
SQL AND Operator

Answer: d. SQL AND Operator

34. The original motive of SQL is

To specify the syntax and semantics of SQL manipulation language
To define data structures
To specify the syntax and semantics of SQL data definition language
All of the above

Answer: d. All of the above

35. _____ command is used to select some particular columns.

UNION
SELECTION
JOIN
PROJECTION

Answer: d. PROJECTION

Ace Your SQL-Based Interviews with IK!

To become a successful software developer, you are required to have in-depth insights into database management systems. SQL is a widely used language for managing relational database management systems (RDBMS), making it indispensable for aspiring software developers aiming for success in the field.

Self-assessment is good, but what if you could know what type of SQL questions top-tier companies are asking? You can do FAANG interview prep course with us and prepare yourself for those tough and challenging interviews. Our seasoned instructors know the type of questions that top companies ask. You can take up our early engineering interview course that covers all the best practices, skills, and tips you need to know to nail these rounds.

FAQs: SQL Interview Questions

What are Joins in SQL?
Join is a clause designed to merge rows from multiple tables with respect to the linked columns between them.

What are the five types of SQL?
Five types of SQL are

Data Query Language (DQL)
Transaction Control Language (TCL)
Data Manipulation Language (DML)
Data Definition Language (DDL)
Data Control Language (DCL)

Explain DBMS in SQL
DBMS, elaborated as Database Management Systems, refers to a software system designed to store, retrieve, and run queries on data from a database. Here, users can generate, review, erase, or modify their data in a database.

What does a SELECT statement do?
The purpose of the SELECT statement is to retrieve zero or more rows from one or more database views or tables.

Name top tech companies that hire SQL experts for database management.
Some tech giants like Amazon, Google, Microsoft, Mreta, Apple, Accenture, Deloitte, HSBC, Airbnb, Capgemini, Netflix, Wipro, Tata Consultancy, Infosys, and Wipro hire SQL experts.

State two benefits of SQL.
The two benefits of SQL are

Speed execution and efficiency
Scalable and standardization

Name four basic commands of SQL that every SQL beginner must know.
UPDATE, SELECT, INSERT, and DELETE are four basic commands of SQL for beginners.

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AUTHOR

Naina Batra

Manager, Content Marketing

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