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. In database terms, what does ACID stand for?

All Columns Indexed and Defined

Atomicity, Consistency, Isolation, Durability

Advanced Constraints and Index Definitions

Aggregate, Combine, Insert, Delete

3. What does SQL stand for in the context of databases?

Structured Query Language

System Query Language

Sequential Query Language

Standardized Query Language

4. What is the purpose of the GROUP BY clause in SQL?

To filter rows based on a condition

To sort the result set

To group rows that have the same values in specified columns

To perform mathematical calculations on numeric columns

5. 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

6. 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

7. Which SQL statement is used to add a new column to an existing table?

ADD COLUMN

ALTER TABLE

INSERT INTO

CREATE COLUMN

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. 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.

10. Which of the following is an example of an aggregate function in SQL?

JOIN

COUNT

WHERE

GROUP

11. In a relational database, what is a stored procedure?

A group of related data

A precompiled collection of one or more SQL statements

An index created on a specific column

A constraint that ensures uniqueness

12. Discuss the concept of database denormalization and situations where it might be considered beneficial.

Denormalization involves intentionally introducing redundancy in a database to improve query performance. It may be considered beneficial in scenarios with complex queries and read-heavy workloads.

Denormalization is always detrimental to database performance and should be avoided.

Denormalization is only suitable for write-heavy workloads and has no impact on query performance.

Denormalization is a technique to remove all redundancy from a database, improving overall performance.

13. In the context of databases, what is a subquery?

A precompiled collection of one or more SQL statements

An event that automatically invokes an action

A query nested within another query

An index created on a specific column

14. 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

15. What is normalization in the context of database design?

Reducing redundancy and dependency

Increasing data redundancy

Optimizing query performance

Enhancing data encryption

16. What is the purpose of the TRUNCATE statement in SQL?

To filter rows based on a condition

To remove all data from a table

To commit changes made during the current transaction

To sort the result set

17. Which SQL statement is used to revoke previously granted privileges on a database object?

REVOKE

DENY

REMOVE PRIVILEGES

DISALLOW ACCESS

18. 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.

19. Which of the following is an example of a DDL (Data Definition Language) statement?

SELECT

UPDATE

DELETE

CREATE TABLE

20. What does the acronym SQL stand for?

Structured Question Language

System Query Language

Sequential Query Language

Structured Query Language

21. 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

22. 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.

23. Examine the role of the EXPLAIN statement in SQL and how it can be used to optimize queries.

The EXPLAIN statement provides insight into the query execution plan, allowing database administrators to analyze and optimize query performance.

The EXPLAIN statement is used to execute queries and has no impact on optimization.

The EXPLAIN statement is only relevant for simple queries and has limited impact on optimization.

The EXPLAIN statement is used to retrieve data from multiple tables but does not affect query performance.

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

Optimizing query performance

Reducing redundancy and dependency

Increasing data redundancy

Enhancing data encryption

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

MySQL

Oracle

MongoDB

PostgreSQL

26. What is the purpose of the CHECK constraint in a database?

Ensures uniqueness of a column

Defines a default value

Specifies a condition that must be true for each row

Links a column to another table's primary key

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

INSERT INTO

CREATE

ADD

NEW DATA

28. Which SQL clause is used to filter the results of a SELECT statement?

ORDER BY

GROUP BY

WHERE

HAVING

29. Examine the purpose of the GROUPING SETS clause in SQL and how it differs from the GROUP BY clause.

GROUPING SETS allows grouping of data based on multiple columns or expressions, providing a more flexible grouping mechanism than GROUP BY.

GROUPING SETS and GROUP BY are interchangeable in SQL.

GROUPING SETS is only used for sorting data, while GROUP BY is used for grouping.

GROUPING SETS and GROUP BY have no impact on query performance.

30. 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

31. What is the purpose of the ROLLBACK statement in SQL?

To filter rows based on a condition

To undo changes made during the current transaction

To commit changes made during the current transaction

To sort the result set

32. What is the purpose of the DISTINCT keyword in a SELECT statement?

To filter rows based on a condition

To sort the result set

To remove duplicate rows from the result set

To group rows based on a condition

33. 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

34. 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

35. 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

36. What is the purpose of the LIMIT clause in SQL?

To filter rows based on a condition

To limit the number of rows returned in the result set

To group rows based on a condition

To sort the result set

37. What is the purpose of the HAVING clause in SQL, and how is it different from the WHERE clause?

HAVING is used for filtering rows based on conditions, while WHERE is used for grouping rows.

HAVING is used for grouping rows, while WHERE is used for filtering rows based on conditions.

HAVING and WHERE are interchangeable in SQL.

HAVING is used for sorting rows, while WHERE is used for filtering rows based on conditions.

38. Which SQL statement is used to delete data from a database?

REMOVE FROM

DELETE

ERASE

DROP

39. What is the purpose of the ORDER BY clause in SQL?

To filter rows based on a condition

To sort the result set

To group rows based on a condition

To perform mathematical calculations on numeric columns

40. In the context of databases, what is a stored function?

A group of related data

A precompiled collection of one or more SQL statements

A user-defined operation that returns a single value

An ordered list of values with corresponding row locations

RDBMS MCQ Test 2