Percentage on report page

Question

Hi
Please can you help with this problem---
Generating report that tells the percentage of pple that failed exams, oral or written
here what I have now as count result
select distinct last_name, count(oral_reslt) Oral_Result,
count(written) written_RESULT,
from PHY_TEST
where (result='Fail'
or
PHY_RSLT='Fail')
group by (id,Last_name)
how do I calculate the percentage
Please help
Thank you

Answer 1

Ok, here's a little demo of how analytics can help (Vikas was right when he said ratio_to_report would work for you).
jes@DBTEST> create table phy_test(id number,
  last_name varchar2(20),
  oral_reslt varchar2(4),
  written varchar2(4));
Table created.
jes@DBTEST> insert into phy_test values (1, 'Smith', 'Fail', 'Fail');
1 row created.
jes@DBTEST> insert into phy_test values (2, 'Jones', 'Pass', 'Fail');
1 row created.
jes@DBTEST> insert into phy_test values (3, 'Williams', 'Pass', 'Pass');
1 row created.
jes@DBTEST> insert into phy_test values (4, 'Watson', 'Fail', 'Pass');
1 row created.
jes@DBTEST> commit;
Commit complete.
jes@DBTEST> select * from phy_test;
        ID LAST_NAME            ORAL WRIT
         1 Smith                Fail Fail
         2 Jones                Pass Fail
         3 Williams             Pass Pass
         4 Watson               Fail Pass
jes@DBTEST> select
  last_name,
  oral_reslt,
  written,
  ratio_to_report(1) over (partition by oral_reslt) * 100 as oral_percent,
  count(*) over (partition by oral_reslt) as oral_count,
  count(*) over () as oral_count_total,
  ratio_to_report(1) over (partition by written) * 100 as written_percent,
  count(*) over (partition by written) as written_count,
  count(*) over () as written_count_total
  from phy_test
LAST_NAME            ORAL WRIT ORAL_PERCENT ORAL_COUNT ORAL_COUNT_TOTAL WRITTEN_PERCENT WRITTEN_COUNT WRITTEN_COUNT_TOTAL
Smith                Fail Fail           50          2                4              50             2                   4
Watson               Fail Pass           50          2                4              50             2                   4
Jones                Pass Fail           50          2                4              50             2                   4
Williams             Pass Pass           50          2                4              50             2                   4
jes@DBTEST> insert into phy_test values (5, 'Wolfgang', 'Pass', 'Fail');
1 row created.
jes@DBTEST> select
  last_name,
  oral_reslt,
  written,
  ratio_to_report(1) over (partition by oral_reslt) * 100 as oral_percent,
  count(*) over (partition by oral_reslt) as oral_count,
  count(*) over () as oral_count_total,
  ratio_to_report(1) over (partition by written) * 100 as written_percent,
  count(*) over (partition by written) as written_count,
  count(*) over () as written_count_total
  from phy_test
LAST_NAME            ORAL WRIT ORAL_PERCENT ORAL_COUNT ORAL_COUNT_TOTAL WRITTEN_PERCENT WRITTEN_COUNT WRITTEN_COUNT_TOTAL
Smith                Fail Fail           50          2                5      33.3333333             3                   5
Watson               Fail Pass           50          2                5              50             2                   5
Jones                Pass Fail   33.3333333          3                5      33.3333333             3                   5
Wolfgang             Pass Fail   33.3333333          3                5      33.3333333             3                   5
Williams             Pass Pass   33.3333333          3                5              50             2                   5It should be fairly self explanatory and you should be able to adapt it to your own query.