- 1. Database management involves the design, implementation, and maintenance of database systems to efficiently store and retrieve data. It includes tasks such as defining database structures, organizing data, ensuring data integrity, and optimizing database performance. Database management also encompasses security measures to protect data from unauthorized access or corruption. Effective database management is crucial for businesses to make informed decisions, streamline operations, and enhance customer experiences.
Which language is commonly used to query databases?
A) Java
B) Python
C) SQL
D) C++
- 2. What does CRUD stand for in database management?
A) Create, Read, Update, Delete
B) Copy, Read, Upload, Display
C) Calculate, Rearrange, Update, Delete
D) Connect, Retrieve, Utilize, Delete
- 3. What is normalization in database design?
A) Organizing data to minimize redundancy
B) Deleting unnecessary data
C) Adding duplicate records for safety
D) Scrambling data for security
- 4. What type of relationship exists between two tables when one record in the first table can have many related records in the second table?
A) Many-to-Many
B) One-to-One
C) None of the above
D) One-to-Many
- 5. Which of the following is a NoSQL database?
A) MongoDB
B) MySQL
C) PostgreSQL
D) Oracle
- 6. Which command is used to remove a table from a database?
A) REMOVE TABLE
B) ERASE TABLE
C) DROP TABLE
D) DELETE TABLE
- 7. Which statement is used to retrieve data from a database?
A) FETCH
B) SEARCH
C) RETRIEVE
D) SELECT
- 8. What is the purpose of an index in a database?
A) To limit data access
B) To slow down data retrieval
C) To speed up data retrieval
D) To confuse the database engine
- 9. Which type of join returns all records when there is a match in both tables?
A) RIGHT JOIN
B) INNER JOIN
C) LEFT JOIN
D) OUTER JOIN
- 10. What is data integrity in database management?
A) The size of the database
B) The speed of data retrieval
C) The structure of the data
D) The accuracy, consistency, and reliability of data stored in a database
- 11. Which command is used to change the structure of a table in a database?
A) ALTER TABLE
B) RESTRUCTURE TABLE
C) MODIFY TABLE
D) CHANGE TABLE
- 12. What does the term 'relational database' refer to?
A) A type of database that stores and provides access to data points that are related to one another
B) A database that stores only text data
C) A database without any relationships
D) A database used by multiple organizations
- 13. What is a backup in database management?
A) A copy of data that can be restored in case of data loss
B) A report of database activities
C) A separate database
D) Data sent to a remote location
- 14. Which type of database model uses a tree-like structure with parent-child relationships?
A) NoSQL model
B) Relational model
C) Hierarchical model
D) Network model
- 15. What is denormalization in database design?
A) Encrypting all data
B) Intentionally adding redundancy to improve performance
C) Organizing data logically
D) Removing unnecessary data
- 16. Which command is used to query data from multiple tables in a database?
A) MERGE
B) COMBINE
C) LINK
D) JOIN
- 17. Which SQL statement is used to insert new data into a database?
A) SELECT *
B) CREATE TABLE
C) INSERT INTO
D) UPDATE
- 18. Which database model uses tables to store data and relationships between those tables?
A) NoSQL
B) Object-oriented
C) Hierarchical
D) Relational
- 19. Which SQL clause is used to filter records in a SELECT statement based on a specified condition?
A) GROUP BY
B) WHERE
C) HAVING
D) ORDER BY
- 20. Which type of database model allows for flexible and scalable data storage without fixed table schema?
A) NoSQL
B) Relational
C) Object-oriented
D) Hierarchical
- 21. Which SQL clause is used to group rows based on a specified condition?
A) GROUP BY
B) ORDER BY
C) FILTER
D) HAVING
- 22. Which database model allows for objects to be stored as collections of attributes and methods?
A) Hierarchical
B) Object-oriented
C) Network
D) Relational
- 23. Which SQL function is used to calculate the total number of rows that match a specific condition?
A) MAX
B) AVG
C) SUM
D) COUNT
- 24. Which database model represents data as connections or relationships between different entities?
A) Network
B) Relational
C) Hierarchical
D) NoSQL
- 25. What does the term 'OLAP' stand for in database management?
A) Object-Oriented Language Adaptation Protocol
B) Offline Automated Processing
C) Optimized Local Access Protocol
D) Online Analytical Processing
- 26. Which type of database relationship requires a linking table?
A) Many-to-One
B) One-to-Many
C) One-to-One
D) Many-to-Many
- 27. What does SQL stand for?
A) Software Query Library
B) Structured Query Language
C) System Query Logic
D) Standardized Query Language
- 28. Which database management system is open-source and commonly used for web applications?
A) IBM Db2
B) Oracle Database
C) MySQL
D) Microsoft SQL Server
- 29. Which statement is used to enforce referential integrity in a database?
A) PRIMARY KEY
B) CHECK
C) UNIQUE
D) FOREIGN KEY
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