POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the purpose of the COALESCE function in PostgreSQL?

Can you use the COALESCE function with only one argument in PostgreSQL?

Is the COALESCE function in PostgreSQL able to handle different data types?

How does the COALESCE function improve query performance in PostgreSQL?

Can you explain how COALESCE differs from the NULLIF function in PostgreSQL?

What happens if all arguments in the COALESCE function are null in PostgreSQL?

How would you use COALESCE to handle missing data in a PostgreSQL report?

What are some potential pitfalls when using COALESCE in complex PostgreSQL queries?

How can COALESCE be used in PostgreSQL to combine multiple columns into a single result?

During a PostgreSQL certification exam, how might you use COALESCE to ensure data integrity in a database migration scenario?