A release of Matrix for some enthusiastic students

Hi people,
Greetings. I am trying to create a matrix of output for students who have decided to take music and/or Sports or not. I'm hoping to break down by age and sex and interest (Music/Sports).

Any help is greatly appreciated!

Thank you

Scripts to create the tables and INSERT records

create table student_tb(student_id varchar2(4), birth_date date, gender varchar2(1));
create table sports_tb (student_id varchar2(4));
create table music_tb  (student_id varchar2(4));

-- INSERTing into STUDENT_TB
insert into student_tb (student_id,birth_date,gender) values ('1001',to_date('01-JAN-90','DD-MON-RR'),'M');
insert into student_tb (student_id,birth_date,gender) values ('1002',to_date('10-JUL-91','DD-MON-RR'),'M');
insert into student_tb (student_id,birth_date,gender) values ('1003',to_date('01-DEC-90','DD-MON-RR'),'M');
insert into student_tb (student_id,birth_date,gender) values ('1004',to_date('10-AUG-92','DD-MON-RR'),'F');
insert into student_tb (student_id,birth_date,gender) values ('1005',to_date('01-JAN-91','DD-MON-RR'),'F');
insert into student_tb (student_id,birth_date,gender) values ('1006',to_date('01-FEB-91','DD-MON-RR'),'F');
insert into student_tb (student_id,birth_date,gender) values ('1007',to_date('01-AUG-90','DD-MON-RR'),'M');
insert into student_tb (student_id,birth_date,gender) values ('1008',to_date('01-SEP-90','DD-MON-RR'),'F');
insert into student_tb (student_id,birth_date,gender) values ('1009',to_date('01-OCT-90','DD-MON-RR'),'F');
insert into student_tb (student_id,birth_date,gender) values ('1010',to_date('10-MAR-89','DD-MON-RR'),'F');

-- INSERTing into SPORTS_TB
insert into sports_tb (student_id) values ('1001');
insert into sports_tb (student_id) values ('1004');
insert into sports_tb (student_id) values ('1005');
insert into sports_tb (student_id) values ('1009');
insert into sports_tb (student_id) values ('1010');


-- INSERTing into MUSIC_TB
insert into music_tb (student_id) values ('1001');
insert into music_tb (student_id) values ('1003');
insert into music_tb (student_id) values ('1010');

I hope to have a release in this way
Please note that I have no intention on adding males and females on a row by row basis. That's because it's the same student that would be involved in each category (MUSIC/SPORTS)

--------- MUSIC -------------------- SPORTS -----------
     Females      Males         Females        Males
Age            
20    0             0              1             0
21    0             0              0             0
22    0             1              2             0
23    0             1              0             1
24    1             0              1             0

My query - problem: I clear all data here, but I lost the information where how many girls or boys take Sports, music or nor

select age,
       sum(female) female_count,
       sum(male)   male_count,
       count(music_student_id) music_count,
       count(sport_student_id) sports_count
from
(
  select age, male, female, students.student_id student_id, music.student_id music_student_id, sports.student_id sport_student_id
  from
  (
    select student_id, trunc(months_between(sysdate, birth_date)/12) age,
           (
             case gender
               when 'F' then 1
               else 0
             end
           ) female,
           (
             case gender
               when 'M' then 1
               else 0
             end
           ) male
    from   student_tb
  ) students,
  (
    select student_id from music_tb
  ) music,
  (
    select student_id from sports_tb
  ) sports
  where students.student_id = music.student_id(+)
  and   students.student_id = sports.student_id(+)
)
group by age
order by age;

SQL> select age,
  2            sum(case when gender='F' and mid is not null then 1 else 0 end) music_females,
  3            sum(case when gender='M' and mid is not null then 1 else 0 end) music_males,
  4            sum(case when gender='F' and sid is not null then 1 else 0 end) sport_females,
  5            sum(case when gender='M' and sid is not null then 1 else 0 end) sport_males
  6  from (
  7  select trunc(months_between(sysdate, a.birth_date)/12) age, a.gender, s.student_id sid, m.student_id mid
  8       from student_tb a, sports_tb s, music_tb m
  9       where a.student_id = s.student_id (+)
 10            and a.student_id = m.student_id (+)
 11  ) group by age
 12  order by age;

       AGE MUSIC_FEMALES MUSIC_MALES SPORT_FEMALES SPORT_MALES
---------- ------------- ----------- ------------- -----------
        20             0           0             1           0
        21             0           0             0           0
        22             0           1             2           0
        23             0           1             0           1
        24             1           0             1           0

Tags: Database

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