POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the purpose of the DEFAULT constraint in PostgreSQL?

How does the DEFAULT constraint enhance data integrity in PostgreSQL?

Can you modify the default value of a column with an existing DEFAULT constraint in PostgreSQL?

What happens if a column with a DEFAULT constraint in PostgreSQL is explicitly set to NULL during an insert operation?

How do you handle DEFAULT constraints when inserting data into a PostgreSQL table using a SELECT statement?

Can you have different default values for different columns in the same table in PostgreSQL?

What are the performance implications of using DEFAULT constraints in PostgreSQL, particularly with large datasets?

Explain how DEFAULT constraints interact with PostgreSQL's inheritance feature for tables.

Discuss the impact of the DEFAULT constraint on data migration and replication in PostgreSQL.

How would you handle a scenario where you need to change the default value of a column in a PostgreSQL table with minimal downtime?