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 database system that only allows unstructured 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 file-based system for data storage
Question 2
In a relational database, what does a foreign key do?
1
Establishes a relationship between two tables
2
Automatically indexes data
3
Ensures a table has at least one row
4
Uniquely identifies a row in a table
Question 3
Which of the following is an example of an RDBMS?
1
MySQL
2
Firebase
3
MongoDB
4
Neo4j
Question 4
What is the purpose of the PRIMARY KEY in a table?
1
To store null values
2
To create foreign keys
3
To allow duplicate values
4
To uniquely identify each row
Question 5
In a relational database, what does normalization help to achieve?
1
Increasing redundancy
2
Slowing down performance
3
Increasing complexity
4
Reducing redundancy
Question 6
What is the primary advantage of using a key-value store over a relational database?
1
Requires less storage space
2
Better support for complex joins
3
Fast lookup and retrieval of data
4
Stronger ACID compliance
Question 7
What is the primary disadvantage of key-value stores compared to relational databases?
1
Requires more memory
2
Lack of complex query capabilities
3
Poor performance for key lookups
4
Does not support distributed systems
Question 8
Which of the following is NOT an example of a key-value database?
1
Memcached
2
PostgreSQL
3
Cassandra
4
DynamoDB
Question 9
Which SQL statement is used to retrieve unique values from a column?
1
SELECT UNIQUE column_name FROM table_name;
2
SELECT DIFFERENT column_name FROM table_name;
3
SELECT column_name FROM table_name WHERE DISTINCT;
4
SELECT DISTINCT column_name FROM table_name;
Question 10
What does SQL stand for?
1
Sequential Query Language
2
Standardized Query Logic
3
Structured Query Language
4
System 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
CLEAR
4
DELETE
Question 12
Which SQL join returns only the matching rows from both tables?
1
LEFT JOIN
2
INNER JOIN
3
FULL JOIN
4
RIGHT JOIN
Question 13
Which SQL constraint ensures that a column cannot have NULL values?
1
NOT NULL
2
CHECK
3
PRIMARY KEY
4
UNIQUE
Question 14
Which of the following is NOT an SQL aggregate function?
1
AVG()
2
CONCAT()
3
COUNT()
4
SUM()
Question 15
Which SQL clause is used to filter records from a table?
1
ORDER BY
2
WHERE
3
HAVING
4
GROUP BY
Question 16
Which SQL JOIN returns all records from the left table and only matching records from the right table?
1
INNER JOIN
2
LEFT JOIN
3
FULL JOIN
4
RIGHT JOIN
Question 17
Which constraint is used to ensure that all values in a column are unique?
1
UNIQUE
2
FOREIGN KEY
3
NOT NULL
4
CHECK
Question 18
Which SQL clause is used with aggregate functions to group results?
1
ORDER BY
2
GROUP BY
3
DISTINCT
4
HAVING
Question 19
Which database index type speeds up text searches in SQL?
1
Full-Text Index
2
Clustered Index
3
Hash Index
4
B-Tree Index
Question 20
Which SQL command is used to permanently save changes in a transaction?
1
ROLLBACK
2
COMMIT
3
DELETE
4
SAVEPOINT
Question 21
Which normal form removes partial dependency?
1
BCNF
2
3NF
3
2NF
4
1NF
Question 22
Which index type does MySQL use by default for primary keys?
1
B-Tree Index
2
Full-Text Index
3
Hash Index
4
Bitmap Index
Question 23
Which SQL command creates a virtual table?
1
CREATE VIEW
2
CREATE INDEX
3
CREATE PROCEDURE
4
CREATE TABLE
Question 24
Which keyword is used to define an output parameter in an SQL stored procedure?
1
RETURN
2
OUTPUT
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
Isolation
3
Atomicity
4
Consistency
Question 26
What is the main goal of normalization in a database?
1
To increase redundancy
2
To minimize redundancy and improve data integrity
3
To reduce data integrity
4
To store data in a single large table
Question 27
What does ACID stand for in DBMS?
1
Access, Control, Integrity, Data
2
Atomicity, Consistency, Isolation, Durability
3
Accuracy, Consistency, Isolation, Database
4
Automation, Control, Integrity, Dependency
Question 28
Which of the following is NOT a type of database model?
1
Linear
2
Network
3
Hierarchical
4
Graph-based
Question 29
Which of the following SQL commands is used to remove all records from a table but keep its structure?
1
ALTER
2
TRUNCATE
3
DROP
4
DELETE
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