Oracle sql to count instances of different values in single column

Question

I have a table with status column. I want an Oracle sql query which will list me count of rows in each status in only one row. for eg if my table is

Table A
         


        

Answer 1

select fkey,
       sum(case when status = 20 then 1 else 0 end) as count_status20,
       sum(case when status = 30 then 1 else 0 end) as count_status30,
       sum(case when status = 40 then 1 else 0 end) as count_status40,
from your_table
group by fkey