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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) Deleting old data.
C) Creating duplicate records.
D) Adding extra data to improve accuracy.
  • 2. What is ACID in database transactions?
A) Atomicity, Consistency, Isolation, Durability.
B) Atomicity, Convergent, Isolation, Dispersion.
C) Asset, Consistency, Independence, Durability.
D) Aggregate, Consistency, Isolation, Duration.
  • 3. What is a database index used for?
A) Encrypting data.
B) Improving the speed of data retrieval operations.
C) Deleting records.
D) Adding security to the database.
  • 4. What does CRUD stand for in database operations?
A) Create, Refresh, Undo, Dump.
B) Copy, Remove, Use, Delete.
C) Create, Read, Update, Delete.
D) Calculate, Rank, Update, Delete.
  • 5. What is a database trigger?
A) A type of encryption.
B) An error message.
C) A security warning.
D) Automated response to a specific event in a database.
  • 6. In a relational database, what is a join?
A) Combining rows from two or more tables based on a related column.
B) Changing the primary key.
C) Deleting duplicate records.
D) Separating data into different tables.
  • 7. What does DBMS stand for?
A) Database Management System.
B) Data Backup and Migration Service.
C) Digital Banking Management System.
D) Dynamic Business Model Software.
  • 8. What is the purpose of an ETL process in databases?
A) Enable Table Linking.
B) Encrypt, Transmit, Log data.
C) Establish Table Licensing.
D) Extract, Transform, Load data from various sources into a data warehouse.
  • 9. Which of the following is a NoSQL database system?
A) MySQL
B) MongoDB
C) SQLite
D) Oracle Database
  • 10. What is a database constraint?
A) A database user's access level.
B) A report produced by the database.
C) A physical database backup.
D) Rules that define acceptable values or conditions for data in the database.
  • 11. 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.
  • 12. Which database management system is known for being open-source and developed by Oracle?
A) PostgreSQL
B) DB2
C) MySQL
D) SQL Server
  • 13. What is a query in a database?
A) A database error.
B) A request for data or information from a database table.
C) A type of database model.
D) A database replication process.
  • 14. What is the process of organizing data into a series of tables related by common fields known as?
A) Normalization
B) Optimization
C) Denormalization
D) Indexing
  • 15. Which SQL keyword is used to filter records based on a condition?
A) ORDER BY
B) WHERE
C) SELECT
D) FROM
  • 16. What is a database index?
A) A report generation tool.
B) A data structure that improves the speed of data retrieval operations on a database table.
C) A type of database model.
D) A file containing all database records.
  • 17. What is the purpose of a database administrator (DBA)?
A) To delete data from the database.
B) To manage and maintain the database system.
C) To design the physical database schema.
D) To develop database applications.
  • 18. What does SQL stand for?
A) Sequential Query Language
B) Structured Query Language
C) Series Query Language
D) Structured Query Logic
  • 19. Which type of join in SQL returns all rows from both tables, joining records where available?
A) Inner Join
B) Full Outer Join
C) Left Join
D) Cross Join
  • 20. What is the purpose of data modeling in databases?
A) To create a visual representation of the database structure.
B) To encrypt all data.
C) To slow down data retrieval.
D) To make data unavailable for querying.
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