Separate values for the pre-treatment and results of the comprehensive review (without using the PL/SQL)

Hi people,
This year was difficult because it does not clearly justify what I want to achieve. The main reason for me to try this approach is to reduce the time of the performance. I have my program works very well, but since it accesses a view for each student, slows down the performance.

Purpose of this report: Show all Dates of examination for students, but only to display the results pre and review of the overall assessment on the first line for students.

Table scripts and INSERT statements: 
create table STUDENT_TB(student_id varchar2(4), last_name varchar2(20), first_name varchar2(20), evaluation_date date);
create table EXAM_TB(student_id varchar2(4), exam_date date, result number);
create table EVALUATION_TB(student_id varchar2(4), eval_flag varchar2(1), sampling_date date);

insert into STUDENT_TB values('1001', 'Poppins', 'Mary', to_date('27-SEP-2012', 'DD-MON-YYYY'));
 
insert into EXAM_TB values('1001', to_date('20-APR-2011', 'DD-MON-YYYY'), 30);
insert into EXAM_TB values('1001', to_date('20-MAY-2012', 'DD-MON-YYYY'), 39);
insert into EXAM_TB values('1001', to_date('10-JUL-2012', 'DD-MON-YYYY'), 34);
insert into EXAM_TB values('1001', to_date('10-SEP-2012', 'DD-MON-YYYY'), 39);
insert into EXAM_TB values('1001', to_date('01-DEC-2012', 'DD-MON-YYYY'), 82);
 
insert into evaluation_tb values('1001', null, to_date('22-APR-2011', 'DD-MON-YYYY'));
insert into evaluation_tb values('1001', 'N', to_date('20-JUL-2012', 'DD-MON-YYYY'));
insert into EVALUATION_TB values('1001', 'Y', to_date('10-DEC-2012', 'DD-MON-YYYY'));
Desired output:
SID     Last Name   First Name   Evaluation Date    Exam Date   Results   Order   Pre Evaluation   Overall Evaluation   Accept?
===============================================================================================================================
1001     Poppins         Mary      27-SEP-12         20-APR-11     30       1           N                       Y            Y
1001     Poppins         Mary      27-SEP-12         20-MAY-12     39       2
1001     Poppins         Mary      27-SEP-12         10-JUL-12     34       3
1001     Poppins         Mary      27-SEP-12         10-SEP-12     39       4
1001     Poppins         Mary      27-SEP-12         01-DEC-12     82       5
Business rules:
The Pre, global assessment and accept it? fields are derived. The area of the pre assessment is derived from the EVALUATION_TBtable. Its the value of eval_flag where sampling_date < = evaluation_date.
In our example, the pre assessment should be an "n" while the overall assessment must be a 'Y '. The priority is Y-> N-> Null. The Accept flag is set to a 'Y' If a meadow at overall results past of N to Y or a NULL of Y value.

I have to return all the lines for the student that show the results of the reviews SQL is the following:
I need to join the view EVALUATION_TB. Simply join them of course would be a resulting vector product in 15 files that I don't want. I tried online (subqueries) but I failed again. Any help would be great!
I created the column ord_num to maybe help using only this folder to display the results of the assessment. 
select x.student_id, x.last_name, x.first_name, x.evaluation_date,
       m.exam_date, m.result,
       dense_rank() over (partition by x.student_id order by m.exam_date) ord_num
from
(
  select  s.student_id, s.last_name, s.first_name, s.evaluation_date
  from    student_tb s
) x, exam_tb m
where x.student_id = m.student_id (+);

SID     Last Name   First Name   Evaluation Date    Exam Date   Results   Order
===============================================================================

1001     Poppins     Mary     27-SEP-12     20-APR-11     30     1
1001     Poppins     Mary     27-SEP-12     20-MAY-12     39     2
1001     Poppins     Mary     27-SEP-12     10-JUL-12     34     3
1001     Poppins     Mary     27-SEP-12     10-SEP-12     39     4
1001     Poppins     Mary     27-SEP-12     01-DEC-12     82     5
Thank you!

Published by: Roxyrollers on March 14, 2013 11:37

Published by: Roxyrollers on March 14, 2013 11:38

Published by: Roxyrollers on March 14, 2013 12:27

Published by: Roxyrollers on March 15, 2013 13:43

Hi Roxyrollers,

Please check your insert statements before posting. They have syntax errors.

The following query is to give you the desired result:

with pre_eval as
(
   select e.student_id
        , max(e.eval_flag) keep(dense_rank last order by e.sampling_date) eval_flag
     from evaluation_tb e join student_tb s
          on e.student_id=s.student_id
             and e.sampling_date <= s.evaluation_date
   group by e.student_id
)
,all_eval as
(
   select e.student_id
        , max(e.eval_flag) keep(dense_rank last order by e.sampling_date) eval_flag
     from evaluation_tb e join student_tb s
          on e.student_id=s.student_id
   group by e.student_id
)
, data_with_rank AS
(
   select s.student_id, s.last_name, s.first_name, s.evaluation_date
        , m.exam_date, m.result
        , dense_rank() over (partition by s.student_id order by m.exam_date) ord_num
     from student_tb s
          left outer join exam_tb m
          on (s.student_id = m.student_id)
)
select s.student_id, s.last_name, s.first_name, s.evaluation_date
     , s.exam_date, s.result
     , e.eval_flag as pre_eval
     , a.eval_flag as overall_eval
     , case when a.eval_flag='Y' and e.eval_flag!='Y' then 'Y' end accept
  from data_with_rank s
       left outer join pre_eval e
          on (s.student_id = e.student_id and s.ord_num=1)
       left outer join all_eval a
          on (s.student_id = a.student_id and s.ord_num=1)
order by s.student_id, s.exam_date;

STUDENT_ID LAST_NAME            FIRST_NAME           EVALUATION_DATE EXAM_DATE     RESULT PRE_EVAL OVERALL_EVAL ACCEPT
---------- -------------------- -------------------- --------------- --------- ---------- -------- ------------ ------
1001       Poppins              Mary                 27-SEP-12       20-APR-11         30 N        Y            Y
1001       Poppins              Mary                 27-SEP-12       20-MAY-12         39
1001       Poppins              Mary                 27-SEP-12       10-JUL-12         34
1001       Poppins              Mary                 27-SEP-12       10-SEP-12         39
1001       Poppins              Mary                 27-SEP-12       01-DEC-12         82

However, is not clear to me why the assessment are related only to the first line in the query.
The evaluation_tb table is in fact related to student_id and I expect to be connected all lines.

I've actually linked subqueries pre_eval and all_eval only in line with rank = 1 but I don't understand if that's correct according to business requirements.

Kind regards.
Al

Published by: Alberto Faenza on 14 March 2013 20:29
ORDER BY added, deleted ord_num output

Tags: Database

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