POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is a CHECK constraint in PostgreSQL?

Why would you use a CHECK constraint in a PostgreSQL database?

Can a CHECK constraint refer to multiple columns in PostgreSQL?

How does PostgreSQL enforce a CHECK constraint during an INSERT operation?

What happens if an existing row violates a newly added CHECK constraint in PostgreSQL?

Can you disable a CHECK constraint temporarily in PostgreSQL?

Explain the impact of CHECK constraints on performance in PostgreSQL.

How do CHECK constraints interact with other constraints like UNIQUE and FOREIGN KEY in PostgreSQL?

Can you use user-defined functions in a CHECK constraint in PostgreSQL?

Discuss the differences between CHECK constraints in PostgreSQL and assertions in other database systems.