I'm try to save some precious millisecond in a query.

I have a stats table and I'm calculating the average value of some records grouped by a key

```
Activity.group(:company_id).average(:completed_courses)

```

Everything is ok, but I need also the average on other columns of the same table (`:readed_news, :logins, etc`)

Is there a way to get all the averages with a single query?

I'm using Postgres