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25 uniquely designed questions just for you to evaluate your skills in Relational Database Management System (RDBMS) quiz. Are you ready to challenge yourself and explore more? Let's get started and see how much you can score out of 25.

Test your knowledge of Relational Database Management Systems (RDBMS) with this comprehensive quiz. Explore SQL queries, data integrity, normalization, and more.

Please feel free to report any corrections if you come across any inaccuracies or errors. Your feedback is valuable in maintaining the accuracy of our content.

Questions

1. What does RDBMS stand for?
Answer: Relational Database Management System
Explanation: RDBMS stands for Relational Database Management System, which is a database management system based on the relational model.Report for correction
2. In an RDBMS, what is a primary key?
Answer: A unique identifier for each record in a table
Explanation: A primary key is a column or set of columns in a table that uniquely identifies each record in that table.Report for correction
3. Which SQL command is used to retrieve data from a database in an RDBMS?
Answer: SELECT
Explanation: The SELECT statement in SQL is used to retrieve data from a database.Report for correction
4. What is the purpose of the WHERE clause in an SQL query?
Answer: To filter rows based on a condition
Explanation: The WHERE clause is used to filter rows in an SQL query based on a specified condition.Report for correction
5. In an RDBMS, what is a foreign key?
Answer: A column that references the primary key in another table
Explanation: A foreign key is a column in a table that references the primary key in another table, establishing a relationship between the tables.Report for correction
6. What is normalization in the context of RDBMS?
Answer: The process of organizing data into tables and reducing data redundancy
Explanation: Normalization is the process of organizing data into tables and reducing data redundancy to improve data integrity and efficiency.Report for correction
7. Which type of join returns all rows from both tables, joining them where there is a match?
Answer: FULL JOIN (or FULL OUTER JOIN)
Explanation: A FULL JOIN returns all rows from both tables and joins them where there is a match, including unmatched rows from both tables.Report for correction
8. What is the purpose of the GROUP BY clause in SQL?
Answer: To group rows with the same values in specified columns
Explanation: The GROUP BY clause is used to group rows with the same values in specified columns, often used with aggregate functions like SUM or COUNT.Report for correction
9. Which SQL command is used to add new data to a table in an RDBMS?
Answer: INSERT
Explanation: The INSERT statement in SQL is used to add new data (rows) to a table.Report for correction
10. What is the purpose of the ORDER BY clause in SQL?
Answer: To specify the order of the result set
Explanation: The ORDER BY clause is used to specify the order in which the result set should be returned, either in ascending (ASC) , or descending (DESC) order.Report for correction
11. Which type of index stores a separate data structure to optimize query performance in an RDBMS?
Answer: Non-clustered index
Explanation: A non-clustered index in an RDBMS stores a separate data structure to optimize query performance, whereas a clustered index determines the physical order of the data rows.Report for correction
12. What is the purpose of the COMMIT statement in SQL?
Answer: To save changes made to the database
Explanation: The COMMIT statement in SQL is used to save (commit) changes made to the database since the last COMMIT or ROLLBACK statement.Report for correction
13. In an RDBMS, what is the ACID property?
Answer: A set of properties that ensure reliable database transactions
Explanation: The ACID properties (Atomicity, Consistency, Isolation, Durability) ensure the reliability of database transactions in an RDBMS.Report for correction
14. Which SQL statement is used to modify existing data in a table?
Answer: UPDATE
Explanation: The UPDATE statement in SQL is used to modify existing data (rows) in a table.Report for correction
15. What is the purpose of the JOIN clause in SQL?
Answer: To combine rows from two or more tables
Explanation: The JOIN clause in SQL is used to combine rows from two or more tables based on a related column between them.Report for correction
16. In the context of RDBMS, what is a view?
Answer: A virtual table based on the result of a SELECT query
Explanation: In an RDBMS, a view is a virtual table that is based on the result of a SELECT query and does not store data itself.Report for correction
17. What is a stored procedure in an RDBMS?
Answer: A precompiled and stored set of SQL statements
Explanation: A stored procedure in an RDBMS is a precompiled and stored set of SQL statements that can be executed as a single unit.Report for correction
18. In SQL, what is the purpose of the HAVING clause?
Answer: To filter grouped rows based on a condition
Explanation: The HAVING clause in SQL is used to filter grouped rows based on a condition, typically used with the GROUP BY clause.Report for correction
19. In SQL, which aggregate function returns the number of rows in a result set?
COUNT

COUNT

Answer: COUNT
Explanation: The COUNT aggregate function in SQL returns the number of rows in a result set.Report for correction
20. What is the purpose of the ROLLBACK statement in SQL?
Answer: To undo changes made since the last COMMIT statement
Explanation: The ROLLBACK statement in SQL is used to undo changes made since the last COMMIT statement, ensuring data consistency.Report for correction
21. Which SQL command is used to delete data from a table in an RDBMS?
Answer: DELETE
Explanation: The DELETE statement in SQL is used to remove data (rows) from a table in an RDBMS.Report for correction
22. What is referential integrity in the context of RDBMS?
Answer: Ensuring that foreign key values match primary key values
Explanation: Referential integrity in an RDBMS ensures that foreign key values in one table match the corresponding primary key values in another table, maintaining data consistency.Report for correction
23. What is the purpose of the UNION operator in SQL?
Answer: To combine rows from two or more tables
Explanation: The UNION operator in SQL is used to combine rows from two or more tables into a single result set.Report for correction
24. What is the role of the DBMS in an RDBMS?
Answer: To manage the physical storage of data
Explanation: The Database Management System (DBMS) in an RDBMS is responsible for managing the physical storage of data, among other tasks.Report for correction
25. Which of the following is NOT a valid data type in SQL?
Answer: BOOLEAN
Explanation: BOOLEAN is not a standard SQL data type. SQL databases typically use different data types to represent boolean values, such as BIT or BOOLEAN.Report for correction






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