Filter Data in LTS

Question

Hello All,
I have a table in the physical layer that includes several student records and each student has multiple records and each record has a date column (Test_date). Ultimately, I would like to see only one record per student by the maximum(test_date). I tried to put in the condition in the where clause of the LTS Content tab, however the records get filtered by the maximum test date in the table versus maximum(test_date) by student.
Can you please guide me in setting such a filter or ways to achieve this?
Thanks.

Answer 1

Example:
I made Student_records table in the physical layer using select table as select:
select 'StudentA' as student_name, 1 as record_number, to_date('01.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentA' as student_name, 2 as record_number, to_date('02.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentA' as student_name, 3 as record_number, to_date('03.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentA' as student_name, 4 as record_number, to_date('04.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentB' as student_name, 1 as record_number, to_date('01.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentB' as student_name, 2 as record_number, to_date('02.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentB' as student_name, 3 as record_number, to_date('03.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentC' as student_name, 4 as record_number, to_date('04.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentC' as student_name, 1 as record_number, to_date('01.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentC' as student_name, 2 as record_number, to_date('02.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentC' as student_name, 3 as record_number, to_date('03.01.2009', 'dd.mm.yyyy') as test_date from dual union all
select 'StudentC' as student_name, 4 as record_number, to_date('04.01.2009', 'dd.mm.yyyy') as test_date from dual
I made join with TIMES dimension (TIMES.TIME_ID=Student_records.test_date, both DATE columns), placed them in BMM and in Answers made request using only columns from Student_records logical table (in my case it is identified as a detail table):
Answers columns:
student_name,student_name,test_date
Answers filter (advanced, convert this filter to SQL option):
Student_records.test_date = MAX(Student_records.test_date by Student_records.student_name)
Result:
student_name,student_name,test_date
StudentA,4,*4.1.2009*
StudentB,3,*3.1.2009*
StudentC,4,*4.1.2009*
Regards
Goran
http://108obiee.blogspot.com