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Data has always been an important structural component of every organization. Without proper organization of data, it becomes challenging for employees to work on any project efficiently. To organize the disparate data file formats a database management system was first introduced to the world, in the 1960s. Since then, the adoption of DBMS and relational databases has grown enormously, with around 465,577 organizations using these technologies.
With the rising demand for DBMS, there has been a significant increase in the job roles for different functions. As an aspiring IT professional, you must be well-versed in relational databases and SQL basics to clear interviews and secure a leading position in top-tier IT companies.
Practicing the most-asked DBMS MCQs can help you prepare properly for the tech centric interviews.
What is DBMS?
Database Management Systems (DBMS) are software systems used to gather, organize, retrieve, and run queries on data. They serve as an interface between an end-user and a database. DBMS is the basic component of data management systems. Organizations depend on these systems to manage their data in an efficient way. Database Management Systems allow IT specialists to perform specific operations on data.
Types of Databases
Centralized database
Distributed database
Relational database
Cloud database
Object-oriented database
DBMS MCQs
To evaluate your understanding in the concepts of relational databases, DBMS, and SQL basics, here are certain popularly asked DBMS MCQs.
Q1. Which clause is used to filter rows?
FROM
WHERE
GROUP BY
ORDER BY
Answer: b. WHERE
Q2. A primary key in a table
Must be unique
Can have NULL values
Is used to identify each record uniquely
All of the above
Answer: c. Is used to identify each record uniquely
Q3. Which SQL command is used to make changes to the structure of a table?
ALTER TABLE
MODIFY TABLE
CHANGE TABLE
UPDATE TABLE
Answer: a. ALTER TABLE
Q4. What is a foreign key?
A key used to access data from another table
A key used to identify each record in a table uniquely
A key that establishes a link between two tables
A key that is automatically generated by the database system
Answer: c.A key that establishes a link between two tables
Q5. Which normal form eliminates repeating groups by putting them into separate tables and connecting them through foreign keys?
First Normal Form (1NF)
Second Normal Form (2NF)
Third Normal Form (3NF)
Boyce-Codd Normal Form (BCNF)
Answer: a. First Normal Form (1NF)
Q6. What is the benefit of using a DBMS?
Increased data redundancy
Improved data security
Limited data-sharing capabilities
Decreased data consistency
Answer: b. Improved data security
Q7. What is ACID in database transactions?
Atomic, Consistent, Isolated, Durable
A type of data storage format
A programming language for database management
A method for indexing database records
Answer: a.Atomic, Consistent, Isolated, Durable
Q8. What is the role of GROUP BY in SQL?
To sort query results in ascending order
To filter rows based on a particular condition
To perform aggregate functions on grouped data
To join multiple tables together
Answer: c. To perform aggregate functions on grouped data
Q9. Which type of join returns every row from both tables, joining them where conditions are met and filling in NULLs for missing matches?
INNER JOIN
LEFT JOIN
RIGHT JOIN
FULL OUTER JOIN
Answer: d. FULL OUTER JOIN
Q10. What is "Normalization"?
The process of organizing data to minimize redundancy and dependency
The process of adding indexes to a database table
The process of encrypting sensitive data in a database
The process of backing up a database regularly
Answer: a. The process of organizing data to minimize redundancy and dependency
Also read: 7 Backend Developer Skills You Must Have to Crack Tech Interviews
Q11. What is true about NoSQL databases?
They are based on the relational model
They are suitable for structured data only
They offer high scalability and flexibility
They strictly enforce ACID properties
Answer: c. They offer high scalability and flexibility
Q12. What is the role of the COMMIT statement?
To save all changes made during the transaction
To discard all changes made during the transaction
To roll back the transaction to its starting point
To create a new transaction
Answer: a. To save all changes made during the transaction
Q13. What is the role of an index?
To store large binary objects (BLOBs)
To enforce data integrity constraints
To boost the speed of data retrieval operations
To group related tables together
Answer: c. To boost the speed of data retrieval operations
Q14. What is an example of a NoSQL database?
MySQL
MongoDB
Oracle
PostgreSQL
Answer: b. MongoDB
Q15. What is a schema in a relational database?
A graphical representation of data relationships
A collection of related tables
A blueprint that defines the structure of the database
A database query language
Answer: c. A blueprint that defines the structure of the database
Q16. Which is not a valid SQL constraint?
DEFAULT
CHECK
LIMIT
UNIQUE
Answer: c. LIMIT
Q17. Which type of database replication ensures data consistency in the database?
Master-Slave replication
Multi-Master replication
Snapshot replication
Merge replication
Answer: a. Master-Slave replication
Q18. What is the role of the COMMIT statement in database transactions?
To save all changes made during the transaction
To discard all changes made during the transaction
To roll back the transaction to its starting point
To create a new transaction
Answer: a. To save all changes made during the transaction
Q19. What is the role of a view in a database?
To store data permanently
To provide a virtual representation of data based on specified criteria
To enforce referential integrity constraints
To create indexes for faster data retrieval
Answer: b. To provide a virtual representation of data based on specified criteria
Q20. Which database model represents data as interconnected nodes or graphs?
Relational model
Hierarchical model
Graph model
Object-oriented model
Answer: c. Graph model
Also read: What Is the Career Path for Back-end Engineers?
Start Your Data Journey with Interview Kickstart!
As an aspiring IT specialist who is interested in working with DBMS, you must have in-depth knowledge of DBMS concepts to attempt the database related questions during the tech-based interviews. Consider the DBMS MCQs provided here as just a starter kit to help you perform better in the interviews.
For more in-depth comprehensive interview preparation Interview Kickstart’s backend engineering interview masterclass is ideal for you. The course not only covers DBMS fundamentals, SQL basics but also advanced topics such as database design, object modeling, concurrency and a lot more.
The course also provides comprehensive guidance to prepare you for tech-centric interviews at top-tier IT companies of the world.
FAANG instructors teach this and all other courses at Interview Kickstart. They provide in-depth guidance on likely database MCQs or general questions that may be asked during the interviews.
The instructors also provide aspiring candidates with complete knowledge on behavioral aspects of interviewing, resume building, brand building through Linkedin and salary negotiations.
Also read: Backend Developer Interview Process at FAANG+ Companies
FAQs: Database Management System MCQs for IT Specialists
Q1. What Are the Popular Job Roles Related to DBMS?
Some of the most popular job roles related to DBMS are database administrator, database manager, database developer, data analyst, database designer, and SQL developer.
Q2. How Much Does a Database Administrator Earn?
The average base salary of a database administrator in the USA is $81,960 per year with an additional cash compensation of $21,759. Entry-level DBA salaries start at $83,669 per year while experienced workers make up to $140,310 per year.
Q3. How Many Types of Languages Are Available in DBMS?
The types of languages available in DBMS are:
DDL (Data Definition Language)
DML (Data Manipulation Language)
DCL (Data Control Language)
TCL (Transaction Control Language)
Q4. What All DBMS Related Topics Are Usually Covered in DBMS Interviews?
Topics which are usually covered in DBMS interviews are keys, constraints, functional dependencies, normalization, transactions, joins, and SQL queries.
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