POSTGRESQL DATABASE INTERVIEW QUESTIONS

What does the "IN" keyword do in PostgreSQL?

Can you use the "IN" keyword with a subquery in PostgreSQL?

How does the "IN" keyword differ from the "=" operator in PostgreSQL?

Explain the difference between "IN" and "EXISTS" in PostgreSQL.

Can you use the "IN" keyword with NULL values in PostgreSQL?

How would you optimize a query using the "IN" keyword for better performance in PostgreSQL?

How does PostgreSQL handle "IN" with large lists of values, and what are the potential performance impacts?

Describe a scenario where using "IN" might be less efficient than a join in PostgreSQL.

How does PostgreSQL internally optimize queries using the "IN" keyword?

In a certification exam, you are asked to compare the use of the "IN" keyword in PostgreSQL and ORACLE. What key points would you highlight?