显示Oracle查询中的总计,小计,百分比

Question

题,

我有这样的表:

PID Category Year
1    AAA     2011
2    AAA     2012
3    BBB     2011
4    CCC     2010
5    CCC     2011
6    CCC     2012

我需要将输出显示为:

Subtotal Total Category  Year   Percentage
1         1      CCC      2010    100%
1         2      AAA      2011    50%
1         2      BBB      2011    50%
1         2      AAA      2012    50%
1         2      CCC      2012    50%

小计是特定年份的该类别的计数.总计是特定年份的计数,包括所有类别.百分比是小计/总计*100

Answer 1

select subtotal, 
       total,
       category, 
       year,
       subtotal / total * 100 as percentage
from (
  select count(*) over (partition by category, year) as subtotal,
         count(*) over (partition by year) as total,
         category,
         year
  from the_unknown_table
) t
order by year;