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