SQL MCQs: Sharpen Your Database Management Skills

Preparing for SQL interviews through multiple-choice questions (MCQs) is essential, as it helps candidates familiarize themselves with the types and patterns of questions they might encounter in big interviews.

MCQs are the best way to do self-assessment before you prepare yourself for even the toughest challenges. These SQL MCQs help candidates reinforce core SQL concepts. Candidates can quickly identify areas where they need further study.

MCQs are the first step in self-assessment as candidates can identify their weaknesses and strengths.

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.

Read More: Top 40+ SQL Interview Questions for Experienced Professionals.

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.

1. GRANT and TRUNCATE
2. SELECT and INSERT
3. UPDATE and TRUNCATE
4. ROLLBACK and SAVEPOINT

Answer: d. ROLLBACK and SAVEPOINT

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

1. UPPER
2. TOP
3. MAX
4. None of the above

Answer: c. MAX

3. _________ is not a DDL command.

1. ALTER
2. UPDATE
3. DROP
4. TRUNCATE

Answer: b. UPDATE

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

1. AS clause determines a search condition
2. AS is used with only the JOIN clause
3. AS SQL clause aids in changing column name in the result or assigning a name to a derived column
4. 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.

1. DELETE data from tables
2. Correct or Delete a Database
3. Create Views in the database
4. All of the above

Answer: d. All of the above

6. Common RDBMS in use are:

1. HeidiSQL
2. MySQL
3. Oracle
4. All of the above

Answer: All of the above

7. Choose the invalid SQL type.

1. CHARACTER
2. DECIMAL
3. FLOAT
4. NUMERIC

Answer: b. DECIMAL

8. Match the following:

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

1. ALTER
2. COMMIT
3. CREATE
4. DROP

Answer: a. ALTER

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

1. —
2. /
3. *
4. !

Answer: c. *

11. _____ portrays three basic SQL DML commands.

1. Insert, Update, Delete
2. Alter, Insert, Delete
3. Drop, Update, Delete
4. Update, Drop, Insert

Answer: a. Insert, Update, Delete

12. SELECT operation in SQL is equivalent to

1. The projection operation in relational algebra (except that SELECT in SQL retains duplicates)
2. The selection operation is a relational algebra
3. The projection operation is a relational algebra
4. 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.

1. UPDATE
2. INSERT
3. DROP
4. MODIFY

Answer: a. UPDATE

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

1. GENERATE TABLE
2. BUILD TABLE
3. CREATE TABLE
4. None of the above

Answer: c. CREATE TABLE

15. BLOB in SQL stands for?

1. Binary Language for Objects
2. Binary Large Objects
3. Big Large Objects
4. None of the above

Answer: b. Binary Large Objects

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

1. The code will crash
2. The code will get deleted
3. A blank value gets inserted in that case
4. 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.

1. DROP
2. DELETE
3. ALTER
4. TRUNCATE

Answer: d. TRUNCATE

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

1. Revoke, Grant
2. Insert, Grant
3. DELETE, Revoke
4. Revoke, DEFAULT

Answer: a. Revoke, Grant

19. CRUD is the acronym for

1. Concatenate, Retrieve, Union, Drop
2. Columns, Row, Update, Drop
3. Create, Read, Update, Delete
4. Copy, Run, Update, Display

Answer: c. Create, Read, Update, Delete

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

1. It retrieves the minimum value in a column
2. It calculates the average value of a column
3. It calculates the sum of values in the column
4. 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

1. Entity
2. Tuple
3. Degree
4. None of the above

Answer: Tuple

22. DDL stands for

1. Data Definition Language
2. Data Depletion Language
3. Data Deletion Language
4. None of the above

Answer: Data Definition Language

23. The rows of a relation are called

1. Tuple
2. Entity
3. Degree
4. Commit

Answer: a. Tuple

24. Choose the correct order in SQL.

1. SELECT, WHERE, HAVING, GROUP BY
2. SELECT, GROUP BY, HAVING, WHERE
3. SELECT, HAVING, WHERE, GROUP BY
4. SELECT, WHERE, GROUP BY, HAVING

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

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

1. RETRIEVE
2. SEARCH
3. FIND
4. SELECT

Answer: d. SELECT

26. _______ are types of Unicode character string types.

1. ntext
2. nchar
3. nbar
4. Both a and b

Answer: d. Both a and b.

27. _________ enables to identify a tuple uniquely.

1. Domain
2. Schema
3. Super Key.
4. Attribute

Answer: c. Super Key

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

1. DROP FROM CUSTOMER….
2. UPDATE FROM CUSTOMER…
3. REMOVE FROM CUSTOMER…
4. DELETE FROM CUSTOMER WHERE….

Answer: d. DELETE FROM CUSTOMER WHERE….

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

1. Numeric Data Type
2. Date and time Data Type
3. String Data Type
4. Manipulate Data Type

Answer: d. Manipulate Data Type

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

1. ALTERNATE KEY
2. UNIQUE
3. FOREIGN KEY
4. PRIMARY KEY

Answer: a. ALTERNATE KEY

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

1. DDL
2. TCL
3. DCL
4. SCL

Answer: d. SCL

32.  ________ is not a SQL command.

1. WHERE
2. DELETE
3. ORDER
4. SELECT

Answer: a. DELETE

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

1. SQL SELECT IN
2. SQL UPDATE Statement
3. SQL INSERT INTO
4. SQL AND Operator

Answer: d. SQL AND Operator

34. The original motive of SQL is

1. To specify the syntax and semantics of SQL manipulation language
2. To define data structures
3. To specify the syntax and semantics of SQL data definition language
4. All of the above

Answer: d. All of the above

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

1. UNION
2. SELECTION
3. JOIN
4. 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

1. Data Query Language (DQL)
2. Transaction Control Language (TCL)
3. Data Manipulation Language (DML)
4. Data Definition Language (DDL)
5. 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

1. Speed execution and efficiency
2. 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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