Rigorous Rdbms Test - 66+ MCQs: RDBMS test: Evaluate Your Database Management Knowledge with RDBMS Questions and Answers

1. What is the purpose of the CASE statement in SQL?

To filter rows based on a condition

To perform conditional logic in a SELECT statement

To sort the result set

To group rows based on a condition

2. Which of the following is a benefit of using stored procedures in a database?

Reduced network traffic

Increased data redundancy

Enhanced data encryption

Optimized query performance

3. Define the concept of database materialized views and situations where they can be advantageous.

Materialized views are precomputed snapshots of query results stored in the database. They offer advantages such as improved query performance and reduced load on the database.

Materialized views have no impact on query performance and should be avoided.

Materialized views are only suitable for small-scale databases with simple queries.

Materialized views are used to increase data redundancy and dependency in a database.

4. What is the purpose of the LIKE operator in SQL?

To filter rows based on a condition

To perform pattern matching in a WHERE clause

To sort the result set

To group rows based on a condition

5. What is the purpose of the HAVING clause in SQL?

To filter rows based on a condition

To sort the result set

To group rows based on a condition

To filter the result set after grouping

6. Which of the following is an example of a database constraint?

ORDER BY

GROUP BY

HAVING

UNIQUE

7. What is the purpose of the COALESCE function in SQL?

To filter rows based on a condition

To perform conditional logic in a SELECT statement

To return the first non-null expression in a list

To group rows based on a condition

8. Which of the following is an example of a database trigger?

A stored procedure

An event that automatically invokes an action

A constraint that ensures data integrity

A group of related data

9. What does CRUD stand for in the context of databases?

Create, Retrieve, Update, Delete

Compile, Run, Update, Debug

Copy, Remove, Undo, Delete

Categorize, Revert, Update, Debug

10. Which type of relationship is represented by a foreign key in a database?

One-to-Many

Many-to-Many

One-to-One

None of the above

11. Which of the following is not a primary key constraint?

UNIQUE

NULL

PRIMARY

FOREIGN KEY

12. Discuss the role of database partitioning and situations where it can improve performance.

Database partitioning involves dividing large tables into smaller, more manageable pieces. It can improve query performance by reducing the amount of data that needs to be processed.

Database partitioning is only applicable to small-scale databases and has no impact on performance.

Database partitioning increases data redundancy and dependency.

Database partitioning is useful for write-heavy workloads but does not affect query performance.

13. What does the acronym SQL stand for?

Structured Question Language

System Query Language

Sequential Query Language

Structured Query Language

14. Define the concept of a NoSQL database and provide examples of scenarios where it might be more suitable than a traditional RDBMS.

NoSQL databases are non-relational databases designed for flexible and scalable data storage. They are suitable for scenarios with large volumes of unstructured or semi-structured data, high scalability requirements, and dynamic schemas.

NoSQL databases are only suitable for small-scale applications with structured data.

NoSQL databases have limited scalability compared to traditional RDBMS.

NoSQL databases are primarily designed for strict consistency and are unsuitable for scenarios with dynamic data.

15. In the context of databases, what is a materialized view?

A group of related data

A virtual table based on the result of a SELECT statement

A constraint that ensures data integrity

A precomputed snapshot of a query result

16. Explain the concept of database indexing and its impact on query performance.

Indexing is the process of creating an ordered list of values with corresponding row locations, improving query performance by enabling faster data retrieval.

Indexing has no impact on query performance in a database.

Indexing slows down query performance by introducing additional overhead.

Indexing is only beneficial for read-only databases and has no impact on write operations.

17. Which of the following is an example of a non-relational database?

MySQL

Oracle

MongoDB

PostgreSQL

18. Which of the following is an example of an INNER JOIN?

LEFT JOIN

OUTER JOIN

CROSS JOIN

EQUIJOIN

19. In a relational database, what is a foreign key?

A column that uniquely identifies each row in a table

A column that links to another table's primary key

A column that allows NULL values

A column with a default value

20. What does the term 'Index' refer to in the context of databases?

A group of related data

A collection of SQL statements

An ordered list of values with corresponding row locations

A constraint that ensures data integrity

21. What is the purpose of the UNION operator in SQL?

To filter rows based on a condition

To combine result sets of two or more SELECT statements

To sort the result set

To group rows based on a condition

22. What is the purpose of the JOIN operation in SQL?

To filter rows based on a condition

To combine rows from two or more tables based on a related column

To sort the result set

To group rows based on a condition

23. In the context of databases, what is a database trigger?

A stored procedure

An event that automatically invokes an action

A constraint that ensures data integrity

A group of related data

24. What does the term 'Concurrency Control' refer to in the context of databases?

Ensuring the accuracy and consistency of data

Optimizing query performance

Managing multiple transactions accessing the database simultaneously

Increasing data redundancy

25. Explain the concept of multi-version concurrency control (MVCC) in the context of database transactions.

MVCC allows multiple versions of the same data to coexist, enabling concurrent transactions without blocking. It ensures consistency and isolation in database transactions.

MVCC has no impact on concurrency control in database transactions.

MVCC only applies to single-node databases and is irrelevant in distributed systems.

MVCC increases data redundancy and dependency in a database.

26. What is the purpose of the CASCADE option in a foreign key constraint?

To filter rows based on a condition

To automatically delete or update related rows in the referenced table

To sort the result set

To group rows based on a condition

27. Which SQL statement is used to grant specific privileges on a database object?

GRANT PRIVILEGES

ALLOW ACCESS

GRANT ACCESS

GRANT

28. Which SQL statement is used to add new data to a database?

INSERT INTO

CREATE

ADD

NEW DATA

29. What is the purpose of the ROW_NUMBER() function in SQL?

To filter rows based on a condition

To assign a unique number to each row within a partition

To sort the result set

To group rows based on a condition

30. In the context of databases, what is a cursor?

A group of related data

A virtual table based on the result of a SELECT statement

A pointer used to iterate over a set of rows

An ordered list of values with corresponding row locations

RDBMS MCQ Test 3