oracle sql statement to get counts with pivot, group by or windowing? oracle 11g

Question

Is it possible to and can someone please give me a good example of selecting in one query a result set that returns counts for demographics or other things group by a certain grouping? That really sound cryptic so I am going to add an example output of what I am trying to communicate. I want a result set like:

So for each class a count of fields that are populated for Gender, a count of Male, a count of Female, a count of how many of race that are populated and so forth.

So something like Select curricul.class,count(stu.gender),count(stu.race),count(stu.eth) from curricul,stu group by class pivot( count(gender) for gender in (male, female)

Answer 1

You could simply use:

with curricul as
(select 1 classid, 'Math' class from dual union all
 select 2, 'Literature' from dual
)
,
 student as
( select 1 id, 1 classid, 'male' gender, 1 race, 1 eth from dual union all
    select 2, 1, 'female', 1, 2 from dual union all
    select 3, 1, 'male'  , 3, 1 from dual union all
    select 4, 1, 'male'  , 5, 7 from dual union all
    select 5, 1, 'female', 4, 8 from dual union all
    select 6, 1, 'male'  , 1, 6 from dual union all
    select 7, 2, 'female', 3, 4 from dual union all
    select 8, 2, 'female', 1, 1 from dual union all
    select 9, 2, 'female', 7, 9 from dual union all
    select 10, 2, 'male' , 9, 1 from dual union all
    select 11, 2, 'female', 8, 1 from dual
)
select s.classid, curricul.class  
    ,count(s.gender)  as count_gender
    ,sum(case when gender = 'male' then 1 else 0 end) as count_male
    ,sum(case when gender = 'female' then 1 else 0 end) as count_female
    ,count(s.race)  as count_race
    ,count(s.eth) as count_ethnicity 
from student s
inner join curricul 
    on s.classid = curricul.classid
group by s.classid, curricul.class ;