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