POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the CAST function in PostgreSQL?

Why would you use the CAST function in PostgreSQL?

How does CAST in PostgreSQL differ from type conversion in other databases?

Can you explain the difference between the CAST function and the :: operator in PostgreSQL?

What happens if you try to cast an incompatible data type in PostgreSQL?

Is it possible to cast a NULL value in PostgreSQL? If so, what is the result?

Explain how you can use the CAST function in PostgreSQL to format a timestamp.

Can you cast a JSON object to a text in PostgreSQL? What are the implications of this cast?

How does PostgreSQL handle casting of custom types or user-defined types?

In a PostgreSQL certification exam, you are asked to explain the role of implicit and explicit casts in query optimization. What would be your response?