Aggregate the long tail of a group by query into "others" - sql

Question

I have a table with one dimension and one metric:
name metric
A 4
A 9
B 27
C 9
D 6
I want to group by the dimension and then group the long tail of the results into an 'others' or 'the rest of the data' label.
For example my query should return all the names that the sum of their metrics are greater than 10 and group the rest into 'others':
name metric
A 13
others 15
B 27
I can get this result by aggregating twice:
with T as (
select
name
, (case when sum(metric) > 10 then name else 'others' end) as group_name
, sum(metric) as metric
from MyData
group by name
)
select
group_name as name
, sum(metric) as metric
from T
group by group_name
order by metric
Can I do this in a single operation without using sub queries?
SQL Snippet

Answer 1

I'm pretty certain this requires two levels of aggregation, because the original data doesn't have the information for grouping the names. You need one aggregation to classify the names and one to calculate the final results.
That said, I would write this as:
select (case when sum_metric > 10 then name else 'others' end) as group_name,
sum(sum_metric) as metric
from (select name, sum(metric) as sum_metric
from mydata
group by name
) t
group by group_name;
That said, you could use select distinct and window function for something inscrutable such as:
select distinct (case when sum(metric) > 10 then name else 'others' end),
sum(sum(metric)) over (partition by (case when sum(metric) > 10 then name else 'others' end)) as metric
from mydata
group by name;
However, select distinct is really doing another aggregation. So this eliminates the subquery but not the work.