POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the purpose of the SQL CASE statement in PostgreSQL?

Can you describe the basic structure of a CASE statement in PostgreSQL?

Is the ELSE clause mandatory in a PostgreSQL CASE statement?

How does the CASE statement improve readability and maintainability in PostgreSQL queries?

Can you use a CASE statement in the WHERE clause of a PostgreSQL query?

What happens if multiple WHEN conditions in a CASE statement are true in PostgreSQL?

How can you use a CASE statement to handle NULL values in PostgreSQL?

Describe how nested CASE statements work in PostgreSQL.

Can you explain the performance implications of using CASE statements in PostgreSQL queries?

In a PostgreSQL CASE statement, how would you handle a scenario where you need different calculations based on multiple conditions?