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