POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the purpose of the NOT IN operator in PostgreSQL?

Can you explain how the NOT IN operator works with a simple example?

Is NOT IN case-sensitive in PostgreSQL?

What happens if a NULL value is present in the list used with NOT IN in PostgreSQL?

How can you avoid issues with NULL values when using NOT IN in PostgreSQL?

Compare NOT IN with NOT EXISTS in PostgreSQL.

How would you optimize a query that uses NOT IN with a large list in PostgreSQL?

Can you explain the performance differences between NOT IN and a LEFT JOIN with a NULL check in PostgreSQL?

Describe a scenario where using NOT IN might lead to incorrect results and how to mitigate it.

. In a PostgreSQL certification exam, how would you explain the impact of using NOT IN in a query that involves multiple related tables?