group by - SQL to calculate the overall total and sub total number but unique

Question

I have an example data as below.

I want to calculate user count per city and user count per country.

Here's what I want:

How can I implement it in BigQuery as simple as possible?

Thanks a million!

question from:https://stackoverflow.com/questions/65952566/sql-to-calculate-the-overall-total-and-sub-total-number-but-unique

Answer 1

You can use analytical function as follows:

select distinct country, city,
       count(distinct username) over (partition by country, city) as distinct_users_per_city,
       count(distinct username) over (partition by country) as distinct_users_per_country
  from your_Table t