190+ PostgreSQL MCQ With Online Practice Test

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PostgreSQL, often referred to as Postgres, is a powerful open-source relational database management system (RDBMS) known for its scalability, robustness, and extensibility. It offers advanced features like ACID compliance, support for complex data types, and support for both SQL and NoSQL data. PostgreSQL is highly regarded for its performance, security, and reliability, making it a popular choice for applications ranging from small startups to large enterprises. Its active developer community continuously enhances and maintains the software. PostgreSQL is an excellent choice for data storage, analysis, and management in various domains, including web applications, data warehousing, and geospatial applications.

41. What is the primary purpose of a database schema in PostgreSQL?

Answer: To group database objects into logical containers

42. In PostgreSQL, what is the purpose of a foreign key constraint in a table?

Answer: To ensure referential integrity between tables

43. What is a surrogate key in the context of database design in PostgreSQL?

Answer: A system-generated unique identifier for a row

44. What is the purpose of an index in PostgreSQL database design?

Answer: To speed up data retrieval by providing quick access to specific columns

45. In PostgreSQL, what does the term "normalization" refer to in database design?

Answer: The process of organizing data in a structured manner to reduce redundancy

46. What is a composite key in PostgreSQL database design?

Answer: A key composed of multiple columns

47. What is an ERD (Entity-Relationship Diagram) used for in database design?

Answer: To visually represent the structure and relationships of database entities

48. In PostgreSQL, what is the purpose of a trigger in a database schema?

Answer: To automatically execute a predefined action when certain database events occur

49. What is a database view in PostgreSQL?

Answer: A virtual table that is based on the result of a SELECT query

50. What is the purpose of the "CASCADE" option in foreign key constraints in PostgreSQL?

Answer: To automatically delete or update related rows in child tables
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