POSTGRESQL DATABASE INTERVIEW QUESTIONS

What does the IS NULL operator do in PostgreSQL?

How would you use the IS NULL operator in a WHERE clause?

Can IS NULL be used with any data type in PostgreSQL?

How does PostgreSQL handle NULL values in comparison operations?

What is the difference between IS NULL and IS NOT NULL in PostgreSQL?

Explain a scenario where using IS NULL is crucial in a PostgreSQL query.

How does the behavior of IS NULL in PostgreSQL compare to its behavior in Oracle SQL?

Describe how you would use IS NULL in a complex query involving multiple joins in PostgreSQL.

Can IS NULL affect query performance in PostgreSQL, and how would you optimize such queries?

In a PostgreSQL certification exam, how would you explain the importance of handling NULL values using IS NULL in a data migration project from Oracle SQL to PostgreSQL?