POSTGRESQL DATABASE INTERVIEW QUESTIONS

What is the purpose of the CONCAT function in PostgreSQL?

How do you handle null values when using the CONCAT function in PostgreSQL?

Can the CONCAT function be used with numbers in PostgreSQL?

What is the difference between CONCAT and || (double pipe) operators in PostgreSQL?

How can you concatenate strings from multiple rows into a single string in PostgreSQL?

Explain how to concatenate strings with a separator using the CONCAT function in PostgreSQL.

How does PostgreSQL handle character encoding when using the CONCAT function with strings of different encodings?

Can you describe a scenario where using CONCAT might be more beneficial than using string_agg in PostgreSQL?

How would you optimize the performance of a query that involves heavy use of the CONCAT function in PostgreSQL?

How does the CONCAT function in PostgreSQL compare with the CONCAT function in ORACLE, and what are the key differences?