How to round an average to 2 decimal places in PostgreSQL?

Question

I am using PostgreSQL via the Ruby gem \'sequel\'.

I\'m trying to round to two decimal places.

Here\'s my code:

SELECT ROUND(AVG(some_column)         


        

Answer 1

select ROUND(SUM(amount)::numeric, 2) as total_amount FROM transactions

gives: 200234.08