Practice rdbms Quizzes
Prepare for technical interviews with high-quality rdbms quizzes that mirror real industry questions. Each quiz helps you master concepts, improve problem-solving speed and gain the confidence needed for coding tests. Whether revising basics or tackling advanced scenarios, these quizzes ensure structured, effective preparation.
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Learn rdbms step by step with interactive quizzes designed for beginners and learners revising key concepts. Build a strong foundation with clear, structured practice in rdbms.
Question 1
Which of the following best describes an RDBMS?
1
A file-based system for data storage
2
A database system that organizes data in tables with relationships
3
A database system that stores data in key-value pairs
4
A database system that only allows unstructured data storage
Question 2
In a relational database, what does a foreign key do?
1
Ensures a table has at least one row
2
Establishes a relationship between two tables
3
Automatically indexes data
4
Uniquely identifies a row in a table
Question 3
Which of the following is an example of an RDBMS?
1
Neo4j
2
MySQL
3
Firebase
4
MongoDB
Question 4
What is the purpose of the PRIMARY KEY in a table?
1
To uniquely identify each row
2
To allow duplicate values
3
To create foreign keys
4
To store null values
Question 5
In a relational database, what does normalization help to achieve?
1
Slowing down performance
2
Increasing complexity
3
Increasing redundancy
4
Reducing redundancy
Question 6
What is the primary advantage of using a key-value store over a relational database?
1
Better support for complex joins
2
Fast lookup and retrieval of data
3
Stronger ACID compliance
4
Requires less storage space
Question 7
What is the primary disadvantage of key-value stores compared to relational databases?
1
Poor performance for key lookups
2
Lack of complex query capabilities
3
Requires more memory
4
Does not support distributed systems
Question 8
Which of the following is NOT an example of a key-value database?
1
Cassandra
2
Memcached
3
PostgreSQL
4
DynamoDB
Question 9
Which SQL statement is used to retrieve unique values from a column?
1
SELECT DISTINCT column_name FROM table_name;
2
SELECT column_name FROM table_name WHERE DISTINCT;
3
SELECT UNIQUE column_name FROM table_name;
4
SELECT DIFFERENT column_name FROM table_name;
Question 10
What does SQL stand for?
1
Sequential Query Language
2
Standardized Query Logic
3
System Query Language
4
Structured Query Language
Question 11
Which SQL command is used to remove all records from a table without deleting the table structure?
1
DROP
2
TRUNCATE
3
DELETE
4
CLEAR
Question 12
Which SQL join returns only the matching rows from both tables?
1
FULL JOIN
2
INNER JOIN
3
LEFT JOIN
4
RIGHT JOIN
Question 13
Which SQL constraint ensures that a column cannot have NULL values?
1
CHECK
2
NOT NULL
3
UNIQUE
4
PRIMARY KEY
Question 14
Which of the following is NOT an SQL aggregate function?
1
AVG()
2
CONCAT()
3
SUM()
4
COUNT()
Question 15
Which SQL clause is used to filter records from a table?
1
ORDER BY
2
WHERE
3
GROUP BY
4
HAVING
Question 16
Which SQL JOIN returns all records from the left table and only matching records from the right table?
1
INNER JOIN
2
RIGHT JOIN
3
LEFT JOIN
4
FULL JOIN
Question 17
Which constraint is used to ensure that all values in a column are unique?
1
FOREIGN KEY
2
CHECK
3
UNIQUE
4
NOT NULL
Question 18
Which SQL clause is used with aggregate functions to group results?
1
HAVING
2
ORDER BY
3
DISTINCT
4
GROUP BY
Question 19
Which database index type speeds up text searches in SQL?
1
Clustered Index
2
Full-Text Index
3
B-Tree Index
4
Hash Index
Question 20
Which SQL command is used to permanently save changes in a transaction?
1
DELETE
2
SAVEPOINT
3
COMMIT
4
ROLLBACK
Question 21
Which normal form removes partial dependency?
1
2NF
2
1NF
3
BCNF
4
3NF
Question 22
Which index type does MySQL use by default for primary keys?
1
Bitmap Index
2
B-Tree Index
3
Hash Index
4
Full-Text Index
Question 23
Which SQL command creates a virtual table?
1
CREATE INDEX
2
CREATE PROCEDURE
3
CREATE VIEW
4
CREATE TABLE
Question 24
Which keyword is used to define an output parameter in an SQL stored procedure?
1
OUTPUT
2
RETURN
3
OUT
4
RESULT
Question 25
Which ACID property ensures that once a transaction is committed, it remains so even in case of system failure?
1
Durability
2
Consistency
3
Isolation
4
Atomicity
Question 26
What is the main goal of normalization in a database?
1
To increase redundancy
2
To store data in a single large table
3
To reduce data integrity
4
To minimize redundancy and improve data integrity
Question 27
What does ACID stand for in DBMS?
1
Automation, Control, Integrity, Dependency
2
Access, Control, Integrity, Data
3
Atomicity, Consistency, Isolation, Durability
4
Accuracy, Consistency, Isolation, Database
Question 28
Which of the following is NOT a type of database model?
1
Linear
2
Graph-based
3
Network
4
Hierarchical
Question 29
Which of the following SQL commands is used to remove all records from a table but keep its structure?
1
ALTER
2
DELETE
3
TRUNCATE
4
DROP
Question 30
Which of the following is an advantage of NoSQL databases over traditional RDBMS?
1
Schema flexibility
2
Better horizontal scalability
3
Handling unstructured data
4
All of the above