DBMS Interview Questions PDF By ScholarHat
- 1. DBMS Interview Questions MCQs: Essential Questions for Success DBMS Interview Questions MCQ Learning DBMS interview questions MCQ is essential for students to strengthen their understanding of database management systems, a core concept in computer science. These MCQs provide a quick and effective way to revise key topics, test knowledge, and identify areas for improvement. Top 50+ DBMS Interview Questions MCQs Let's learn the most commonly askedDBMS Interview Questions MCQ. In the Interview tutorial, by practicing DBMS interview questions MCQ, students can gain confidence in tackling real-world database problems during interviews. Moreover, mastering these questions enhances their problem-solving skills and prepares them for competitive job oppor tunities.
- 2. Q 1: What does DBMS stand for? (a) Database Management Software (b) Database Maintenance System (c) Database Management System (d) Database Manipulation Software Q 4: What is the primary key in a database? (a) A unique identifier for a table row Q 3: Which of the following is not a type of database? (a) Relational (b) Distributed (c) Hierarchical (d) Data-centric Q 2: Which of the following is an example of a DBMS? (a) MySQL (b) MongoDB (c) Oracle (d) All of the above View Answer ⬇ View Answer ⬇ View Answer ⬇
- 3. (a) SELECT (b) REMOVE (c) DELETE (d) INSERT View Answer (a) DROP TABLE (b) DELETE TABLE (c) REMOVE TABLE (d) ERASE TABLE View Answer ⬇ (b) A key that encrypts data (c) A key that allows duplicate values (d) A foreign key reference View Answer ⬇ (a) A key used for encryption (b) A key that can uniquely identify rows in a table (c) A foreign key reference (d) A key that allows duplicate values (b) To establish a relationship between two tables (c) To store duplicate data (d) To restrict unauthorized access View Answer ⬇ ⬇ Q 8: What is a candidate key in a database? Q 5: Which SQL command is used to delete a table? Q 6: What is the purpose of a foreign key in a database? Q 7: Which of the following is not a valid SQL command?
- 4. View Answer (a) ORDER BY (b) GROUP BY (c) WHERE (d) SELECT View Answer (a) ADD COLUMN (b) ALTER TABLE (c) MODIFY TABLE (d) UPDATE TABLE View Answer ⬇ (a) To reduce data size (b) To speed up data retrieval (c) To establish relationships between tables (d) To enforce unique constraints (a) Reducing data redundancy and improving data integrity (b) Encrypting database tables (c) Creating a backup of a database (d) Duplicating data for faster access View Answer ⬇ ⬇ ⬇ Q 9: What is normalization in DBMS? Q 12: What is the purpose of an index in a database? Q 10: Which SQL clause is used to filter records based on a condition? Q 11: Which command is used to add a new column to an existing table in SQL?
- 5. View Answer (a) 1NF (b) 2NF (c) 3NF (d) BCNF View Answer (a) MongoDB (b) Redis (c) PostgreSQL (d) Cassandra View Answer ⬇ (a) A virtual table based on a SQL query (b) A table with physical storage (c) A stored procedure (d) A backup copy of a database View Answer ⬇ (a) To save changes permanently to the database (b) To undo recent changes (c) To rollback a transaction (d) To close a database connection View Answer ⬇ ⬇ ⬇ Q 13: What is a view in a database? Q 14: Which of the following is not a NoSQL database? Q 15: Which normal form ensures that there are no partial dependencies in a table? Q 16: What is the purpose of the COMMIT command in SQL?
- 6. Q 17: What is a trigger in a database? (a) A type of stored procedure executed automatically in response to certain events (b) A tool to optimize queries (c) A primary key enforcement mechanism (d) A backup command for transactions Q 18: What is the maximum number of primary keys that a table can have? (a) 1 (b) 2 (c) 3 (d) Unlimited Q 19: Which of the following is a valid aggregate function in SQL? (a) COUNT() (b) AVG() (c) SUM() (d) All of the above View Answer ⬇ Q 20: Which SQL keyword is used to sort the result set of a query? (a) SORT BY (b) ORDER BY (c) GROUP BY (d) ARRANGE BY View Answer View Answer ⬇ View Answer ⬇ ⬇
- 7. Q 24: What is a clustered index? (a) An index where the physical order of rows matches the index order (b) An index used only in primary keys (c) An index that allows duplicate values (d) An index used for foreign keys Q 21: Which of the following is a DML (Data Manipulation Language) command in SQL? (a) CREATE (b) DELETE (c) DROP (d) ALTER Q 23: Which of the following SQL statements is used to create a new table? (a) CREATE TABLE (b) INSERT INTO (c) ALTER TABLE (d) UPDATE TABLE Q 22: What is the purpose of the UNIQUE constraint in a database? (a) To prevent duplicate values in a column (b) To define a primary key (c) To create relationships between tables (d) To allow null values View Answer View Answer ⬇ View Answer ⬇ View Answer ⬇ ⬇
- 8. Q 25: Which of the following is not a SQL JOIN type? (a) INNER JOIN (b) OUTER JOIN (c) CROSS JOIN (d) SELECT JOIN Q 28: Which of the following is true for a primary key? (a) It can contain duplicate values (b) It can contain null values (c) It uniquely identifies each row in a table (d) It is optional for a table Q 27: What is the full form of ACID properties in DBMS? (a) Atomicity, Consistency, Isolation, Durability (b) Accuracy, Concurrency, Integrity, Dependability (c) Access, Control, Indexing, Durability (d) Autonomy, Centralization, Isolation, Dependability Q 26: Which of the following best describes normalization? (a) A process to organize data to reduce redundancy (b) A method to ensure foreign keys (c) A process to create duplicate tables (d) A type of SQL command Q 29: Which type of join returns all rows when there is a match in either table? View Answer ⬇ View Answer ⬇ View Answer ⬇ View Answer ⬇
- 9. (a) MySQL (b) PostgreSQL (a) INNER JOIN (b) LEFT JOIN (c) OUTER JOIN (d) CROSS JOIN View Answer ⬇ (a) Deletes all rows and frees space (b) Deletes selected rows (c) Deletes a column (d) Deletes the table View Answer ⬇ (a) Groups rows with different values (b) Groups rows with the same values (c) Groups columns with similar names (d) Groups multiple databases View Answer ⬇ (a) Filters rows before grouping (b) Filters groups based on aggregate functions (c) Filters columns in a table (d) Filters rows after grouping View Answer ⬇ Q 30: What does the GROUP BY clause do in SQL? Q 33: Which of the following is a NoSQL database? Q 32: What does the TRUNCATE command do in SQL? Q 31: What is the function of the HAVING clause in SQL?
- 10. (c) MongoDB (d) Oracle View Answer (a) Intersection (b) Union (c) Join (d) All of the above View Answer ⬇ (a) Relational database (b) NoSQL database (a) To uniquely identify each record (b) To establish relationships between tables (c) To improve query performance (d) To enforce table structure View Answer ⬇ (a) A column that can uniquely identify a record (b) A key that only references other keys (c) A key that cannot be a primary key (d) A key used in foreign tables View Answer ⬇ ⬇ Q 35: What is a candidate key in a relational database? Q 37: What type of database is used to store large amounts of unstructured data? Q 36: What is the main purpose of a foreign key in a database? Q 34: Which of the following is a valid relational database model operation?
- 11. (a) SELECT (b) INSERT (c) UPDATE (d) DELETE View Answer (c) Hierarchical database (d) Network database View Answer ⬇ (a) To write SQL queries (b) To model the database structure (c) To enforce data integrity (d) To improve query optimization View Answer ⬇ (a) A key that contains a single column (b) A key that contains multiple columns (a) An index that sorts and stores the data rows in the table (b) An index that does not sort data but speeds up queries (c) An index created on foreign keys (d) An index for joining multiple tables View Answer ⬇ ⬇ Q 40: What is the main use of an ER diagram? Q 41: What is a composite key in a relational database? Q 39: In the context of database indexes, what is a clustered index? Q 38: Which of the following SQL statements is used to extract data from a database?
- 12. (c) A key used only for indexing (d) A key used in a foreign table View Answer ⬇ (a) Breaking tables into smaller tables (b) Ensuring referential integrity (c) Reducing redundancy and dependency (d) All of the above View Answer ⬇ (a) A query that is stored in the database (b) A condition to check data integrity (c) A procedure automatically executed on events (d) A function to clean up data View Answer ⬇ (a) A database for online transaction processing (b) A database optimized for read-intensive queries (c) A centralized repository for analytical data (a) DELETE removes data, TRUNCATE removes structure (b) DELETE is DML, TRUNCATE is DDL (c) DELETE resets the table, TRUNCATE does not (d) DELETE cannot be rolled back, TRUNCATE can View Answer ⬇ Q 45: What is a data warehouse? Q 43: What is a database trigger? Q 44: What is normalization in a database? Q 42: What is the difference between DELETE and TRUNCATE in SQL?
- 13. (a) MySQL (b) Oracle (c) MongoDB (a) INNER JOIN (b) LEFT JOIN (c) FULL OUTER JOIN (d) SUBJOIN View Answer ⬇ (a) Data redundancy (b) Data inconsistency (c) Unnecessary relationships (d) All of the above View Answer ⬇ (d) A temporary storage for data migration View Answer ⬇ (a) Atomicity, Consistency, Isolation, Durability (b) Automation, Consistency, Integration, Durability (c) Algorithm, Consistency, Isolation, Durability (d) Atomicity, Computation, Isolation, Durability View Answer ⬇ Q 46: What does ACID stand for in the context of database management systems? Q 47: Which of the following is NOT a type of JOIN in SQL? Q 48: What does normalization help to eliminate in a relational database? Q 49: Which of the following is an example of a NoSQL database?
- 14. (a) REMOVE (b) DROP (c) DELETE (d) TRUNCATE View Answer (d) PostgreSQL View Answer ⬇ (a) One-to-one (b) One-to-many (c) Many-to-many (a) Indexing (b) Partitioning (c) Caching (d) All of the above View Answer ⬇ (a) Process of reducing the size of the database (b) Process of combining tables to reduce redundancy (c) Process of merging multiple databases (d) Process of introducing redundancy into a database View Answer ⬇ ⬇ Q 53: Which of the following is used to improve database performance by minimizing access to the database? Q 54: Which of the following is a correct relationship between two tables in a relational database? Q 52: What does the term 'denormalization' refer to in a database? Q 50: Which command is used to remove a table from a database?
- 15. (a) GET (b) SELECT (c) EXTRACT (d) OPEN View Answer (d) All of the above View Answer ⬇ (a) Data Binary Management System (b) Database Management System (c) Database Maintenance System (d) Data Management System View Answer ⬇ (a) To combine data from multiple tables (b) To filter the records (c) To aggregate data based on one or more columns (d) To sort the data View Answer ⬇ (a) A primary key must be unique for each record in the table (b) A primary key can be NULL (c) A primary key can contain duplicate values ⬇ Q 57: What is the full form of DBMS? Q 56: Which SQL statement is used to extract data from a database? Q 58: Which of the following is true about a primary key in a database? Q 55: What is the purpose of using the GROUP BY clause in SQL?
- 16. (a) SELECT (b) WHERE (c) HAVING (d) ORDER BY View Answer (d) A primary key is only used for indexing View Answer ⬇ (a) To combine the results of two queries (b) To return only distinct records from both queries (c) To join two tables based on a common column (d) To delete records from multiple tables View Answer ⬇ (a) The physical storage of data (b) The structure that defines the organization of data (c) The software used to manage the database (d) The access control mechanism for databases View Answer ⬇ (a) A table that stores data permanently (b) A virtual table that provides a specific representation of data (c) A function that calculates values in the database ⬇ Q 59: What is a database schema? Q 61: What is the purpose of the UNION operator in SQL? Q 60: Which SQL clause is used to filter records returned by a query? Q 62: Which of the following is the correct definition of a database view?
- 17. (a) DROP (b) DELETE (c) REMOVE (d) TRUNCATE View Answer (a) INNER JOIN (b) LEFT JOIN (c) RIGHT JOIN (d) FULL OUTER JOIN View Answer ⬇ (a) Indexing (b) Foreign key constraints (c) Normalization (d) All of the above View Answer ⬇ (d) A part of the database used for indexing View Answer ⬇ (a) Normalization reduces data redundancy and improves data integrity (b) Normalization increases data redundancy ⬇ Q 66: Which of the following statements is true about normalization? Q 63: Which SQL statement is used to delete all records from a table but not the table itself? Q 64: Which of the following is used for maintaining data integrity in a database? Q 65: Which type of JOIN returns all records when there is a match in either left (table1) or right (table2) table?
- 18. (a) Hash index (b) B-tree index (c) Bitmap index (d) Clustered index View Answer ⬇ (c) Normalization creates duplicate records (d) Normalization is not necessary in a database View Answer ⬇ (a) A primary key from one table used in another table (b) A key used for indexing the database (c) A key that uniquely identifies a record in a table (d) A key that is used for retrieving data from the database View Answer ⬇ (a) To reduce redundancy and avoid anomalies (b) To increase data redundancy (c) To eliminate the use of indexes (d) To speed up database performance by adding more tables View Answer ⬇ (a) Combining data from two or more tables based on a related column Q 67: What is a foreign key in a relational database? Q 68: Which of the following is the purpose of normalization in database design? Q 70: Which of the following operations is performed by the SQL JOIN clause? Q 69: Which of the following is the most suitable type of index for columns frequently searched using ranges (e.g., between 10 and 50)?
- 19. (b) Deleting data from two tables (c) Creating a new table by merging multiple tables (d) Sorting the result set of multiple queries View Answer ⬇ (a) Ensuring that all primary key values are unique (b) Ensuring that relationships between tables are consistent (c) Ensuring that all data in the database is accurate (d) Ensuring that there is no data redundancy View Answer ⬇ Conclusion In conclusion, mastering DBMS Interview Questions MCQ is crucial for students and professionals aiming to excel in database management concepts. These questions not only test fundamental knowledge but also evaluate advanced problem-solving skills required in real-world scenarios. By practicing a wide range of DBMS MCQ questions, individuals can strengthen their understanding of relational databases, SQL commands, and system architecture. Further Read: Top 50+ Wipro Interview Questions & Answers for Freshers & Experienced (2025) Top Google Interview Questions & Answers for Freshers (2025) Top-Picked 60+ Accenture Interview Q&A for Freshers & Experienced 2025 Dear learners, join our Tech Trendy Masterclasses to help you learn and immerse yourself in the latest trending technologies and upgrade your tech skills with the latest skills trends, design, and practices. Q 71: What does the term "referential integrity" mean in database systems?