PostgreSQL: Performance Test of RETURNS TABLE vs OUT Parameters

One of our PostgreSQL database developers asked one question: What is the performance difference between RETURNS TABLE and OUT parameters?

My simple answer was, no major difference between these two, but RETURNS TABLE is quite faster, easy to write, clear to everyone.

I have prepared two different function one is “plpgsql” and the other is “sql” language.

You can access this demonstration and compare the performance report in your Postgres Environment.

Create a table with sample data:

Create a function to test RETURN TABLE:

Sample Execution:

Performance Report:

Create a function to test the OUT parameter:

Sample Execution:

Performance Report:

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