POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is an UPSERT operation in PostgreSQL?

Why is the UPSERT feature useful in databases?

What keyword is used in PostgreSQL to handle conflicts in an UPSERT operation?

How does PostgreSQL determine which rows to update during an UPSERT operation?

Can you use the RETURNING clause with an UPSERT operation in PostgreSQL?

Explain what happens if no action is specified in the ON CONFLICT clause during an UPSERT operation.

What are the potential performance implications of using UPSERT in PostgreSQL?

How can you ensure data integrity while using UPSERT in a multi-user environment?

What are some use cases where UPSERT is particularly beneficial?

Discuss the limitations or potential issues one might encounter when using the UPSERT feature in PostgreSQL.