POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is an INNER JOIN in PostgreSQL?

Why would you use an INNER JOIN in PostgreSQL?

Can you explain the difference between an INNER JOIN and a LEFT JOIN in PostgreSQL?

How does PostgreSQL handle multiple conditions in an INNER JOIN?

Can you describe a scenario where an INNER JOIN might not return any results in PostgreSQL?

What is the impact of using INNER JOIN on large datasets in PostgreSQL, and how can performance be optimized?

Explain how to perform an INNER JOIN on three tables in PostgreSQL and discuss potential performance implications.

How does PostgreSQL handle NULL values in columns involved in an INNER JOIN?

What are some common pitfalls when using INNER JOIN in PostgreSQL, and how can they be avoided?

During a PostgreSQL certification exam, you are asked to explain the importance of using INNER JOINs over subqueries. What would be your explanation?