First occurrence but not in the same table
As we know, to search for the first occurrence of a particular record, we go with the MIN function. It is however, if all of your records are in the same table.
My scenario is a little different. I have 4 tables (maybe more), but keeping this is simple for the exercise. I need to find the first occurrence of a student who appear in a table and this registration Date. The trick is to NOT include this student in the following tables. To do this, I can use SQL or PL/SQL.
Thanks in advance.
Scripts for Tables (CREATE TABLE and INSERT scripts)
create table time_period(id varchar2(1), start_date date, end_date date);
insert into time_period values('0', to_date('01-DEC-2005', 'DD-MON-YYYY'), to_date('31-MAY-2006','DD-MON-YYYY'));
insert into time_period values('1', to_date('01-JUN-2006', 'DD-MON-YYYY'), to_date('30-NOV-2006','DD-MON-YYYY'));
insert into time_period values('2', to_date('01-DEC-2006', 'DD-MON-YYYY'), to_date('31-MAY-2007','DD-MON-YYYY'));
insert into time_period values('3', to_date('01-JUN-2007', 'DD-MON-YYYY'), to_date('30-NOV-2007','DD-MON-YYYY'));
insert into time_period values('4', to_date('01-DEC-2007', 'DD-MON-YYYY'), to_date('31-MAY-2008','DD-MON-YYYY'));
create table student_test1(student_id varchar2(4), exam_date date);
create table student_test2(student_id varchar2(4), exam_date date);
create table student_test3(student_id varchar2(4), exam_date date);
create table student_test4(student_id varchar2(4), exam_date date);
insert into student_test1 values('1001',to_date('01-DEC-2005','DD-MON-YYYY');
insert into student_test1 values('1002',to_date('01-DEC-2005','DD-MON-YYYY');
insert into student_test2 values('1003',to_date('01-JUN-2006','DD-MON-YYYY');
insert into student_test3 values('1001',to_date('01-NOV-2007','DD-MON-YYYY');
insert into student_test3 values('1004',to_date('01-NOV-2007','DD-MON-YYYY');
insert into student_test4 values('1001',to_date('01-MAY-2008','DD-MON-YYYY');
insert into student_test4 values('1002',to_date('01-MAY-2008','DD-MON-YYYY');
insert into student_test4 values('1003',to_date('01-MAY-2008','DD-MON-YYYY');
insert into student_test4 values('1004',to_date('01-MAY-2008','DD-MON-YYYY');
Desired output should be as follows:
ID Start Date End Date County
0 1 December 05 31 May 06 2 - student ID 1001 and 1002
1 1 June 06 30 November 06 1 - Student ID 1003
2 1 December 06 31 May 07 0 - no
3 1st June 07 1st November 07 1 - Student ID 1004 (1001 should not be taken to the top)
4 1st December 07 to 31 May 08 0 - no. They have all been included in the previous periods
could be done with a UNION ALL operation student_test-tables (and a join with the time table):
with
BaseData as)
Select * from student_test1
Union of all the
Select * from student_test2
Union of all the
Select * from student_test3
Union of all the
Select * from student_test4
)
,
min_values like)
Select student_id, min (exam_date) exam_date
of basedata
Student_id group
)
Select tp.id
tp.start_date
tp.end_date
count (mv.student_id) student_id
of time_period tp
left outer join
min_values mv
on (mv.exam_date between tp.start_date and tp.end_date)
Tp.id group
tp.start_date
tp.end_date
order of tp.id
;
I HAVE START_DA STUDENT_ID END_DATE
- -------- -------- ----------
01.12.05 0 31.05.06 2
1 01.06.06 30.11.06 1
2 01.12.06 31.05.07 0
3 01.06.07 30.11.07 1
4 01.12.07 31.05.08 0
Concerning
Martin
Tags: Database
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