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PostgreSQL Interview Questions and Answers

Ques 1. What is PostgreSQL, and how does it differ from other relational database systems?

PostgreSQL is an open-source relational database management system (RDBMS). It differs from others by its extensibility and support for SQL and procedural languages.

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Ques 2. Explain the concept of ACID properties in the context of databases.

ACID stands for Atomicity, Consistency, Isolation, and Durability, ensuring the reliability of database transactions.

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Ques 3. What is the purpose of the WHERE clause in a PostgreSQL query?

The WHERE clause filters records based on a specified condition, allowing selective data retrieval.

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Ques 4. Describe the role of the PRIMARY KEY constraint in PostgreSQL.

The PRIMARY KEY constraint uniquely identifies each record in a table and ensures data integrity.

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Ques 5. Explain the difference between INNER JOIN and LEFT JOIN in PostgreSQL.

INNER JOIN retrieves rows where there is a match in both tables, while LEFT JOIN retrieves all rows from the left table and matching rows from the right table.

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