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Database
Contributed by: Baker
  • 1. A database is an organized collection of data, typically stored and accessed electronically from a computer system. It is designed to allow for efficient data retrieval, storage, and manipulation. Databases are commonly used in applications such as websites, mobile apps, and enterprise systems to store and manage structured information. They provide a structured way to store, organize, update, and retrieve data, allowing users to perform complex queries and analysis. Different types of databases exist, including relational databases, NoSQL databases, and cloud databases, each with their unique features and use cases. Overall, databases play a crucial role in modern computing by enabling the efficient and secure management of data.

    What is normalization in databases?
A) Organizing data in a database to reduce redundancy.
B) Adding extra data to improve accuracy.
C) Creating duplicate records.
D) Deleting old data.
  • 2. What is ACID in database transactions?
A) Aggregate, Consistency, Isolation, Duration.
B) Asset, Consistency, Independence, Durability.
C) Atomicity, Convergent, Isolation, Dispersion.
D) Atomicity, Consistency, Isolation, Durability.
  • 3. What is a database index used for?
A) Deleting records.
B) Adding security to the database.
C) Improving the speed of data retrieval operations.
D) Encrypting data.
  • 4. What does CRUD stand for in database operations?
A) Create, Refresh, Undo, Dump.
B) Create, Read, Update, Delete.
C) Copy, Remove, Use, Delete.
D) Calculate, Rank, Update, Delete.
  • 5. What is a database trigger?
A) A security warning.
B) A type of encryption.
C) An error message.
D) Automated response to a specific event in a database.
  • 6. In a relational database, what is a join?
A) Deleting duplicate records.
B) Changing the primary key.
C) Separating data into different tables.
D) Combining rows from two or more tables based on a related column.
  • 7. What does DBMS stand for?
A) Dynamic Business Model Software.
B) Database Management System.
C) Digital Banking Management System.
D) Data Backup and Migration Service.
  • 8. What is the purpose of an ETL process in databases?
A) Encrypt, Transmit, Log data.
B) Establish Table Licensing.
C) Enable Table Linking.
D) Extract, Transform, Load data from various sources into a data warehouse.
  • 9. What is a database constraint?
A) A report produced by the database.
B) Rules that define acceptable values or conditions for data in the database.
C) A physical database backup.
D) A database user's access level.
  • 10. What is a database index?
A) A file containing all database records.
B) A type of database model.
C) A data structure that improves the speed of data retrieval operations on a database table.
D) A report generation tool.
  • 11. What is the purpose of a database administrator (DBA)?
A) To develop database applications.
B) To delete data from the database.
C) To manage and maintain the database system.
D) To design the physical database schema.
  • 12. What is a query in a database?
A) A type of database model.
B) A database replication process.
C) A request for data or information from a database table.
D) A database error.
  • 13. What is the purpose of data modeling in databases?
A) To slow down data retrieval.
B) To make data unavailable for querying.
C) To encrypt all data.
D) To create a visual representation of the database structure.
  • 14. In a relational database, what is a foreign key constraint?
A) A key that cannot be changed.
B) An extra security measure.
C) A rule that ensures the referential integrity of the data.
D) A key that allows duplicate values.
  • 15. What does SQL stand for?
A) Sequential Query Language
B) Series Query Language
C) Structured Query Logic
D) Structured Query Language
  • 16. Which of the following is a NoSQL database system?
A) MySQL
B) Oracle Database
C) MongoDB
D) SQLite
  • 17. What is the process of organizing data into a series of tables related by common fields known as?
A) Denormalization
B) Optimization
C) Indexing
D) Normalization
  • 18. Which SQL keyword is used to filter records based on a condition?
A) SELECT
B) WHERE
C) FROM
D) ORDER BY
  • 19. Which database management system is known for being open-source and developed by Oracle?
A) DB2
B) SQL Server
C) MySQL
D) PostgreSQL
  • 20. Which type of join in SQL returns all rows from both tables, joining records where available?
A) Left Join
B) Inner Join
C) Full Outer Join
D) Cross Join
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