新标题：Calculate the average of each group relative to the total sum

Question

I want to get the sum of group A and group B respectively, and then divide by the sum.

I tried using this:

select name, sum(qt)
from ntbl
group by name

order_id	Name	qt
1	one	12
2	one	20
3	B	33
4	B	45

The result should be:

Name	qt	dv
one	32	0.29
B	78	0.70

Answer 1

You can cross-join another subquery that sums all quantities

db<>violinhere

Answer 2

You can combine aggregate functions and window functions together:

select name
     , sum(qt) as sum_qt
     , sum(qt) / sum(sum(qt)) over () * 100 as pct_qt
from t
group by name