Conditions within groups

Question

Hi,
I have a report which has a group sorted on column A. And it has some 5 other columns. Column B is a unique primary key and column C and D are begin and end dates respectively.
My report needs to list down only those records where in the begin date is less than the end date within that group and not for the same unique primary key row. The Begin Date is always less than the end date for any single record. However, I want the records where the begin date is lesser than the end date of the other records in the same group alone.
Example:
A B C D
100 1 01-JAN-07 02-JUN-07
100 2 03-JUL-07 08-SEP-08
200 3 03-DEC-07 29-DEC-07
200 4 30-DEC-07 31-DEC-09
200 5 28-JAN-08 05-FEB-08
Here the begin date "01-JAN-07" is less than the "02-JUN-07" in 1 row and "03-JUL-07" is less than "08-SEP-08" in 2 row. So, I do not want this displayed in the report. However, in 200 series, the discrepancy occurs.
Can anyone please throw me ideas on how to handle this in discoverer.
Your inputs are greatly appreciated.
Thanks!

Answer 1

Create a calculation like:
min(column_d) OVER (partition by column_b)and name the calculation group_end_date.
Then change your condition to something like:
column_d <= group_end_dateFor starters, include the calculation in the worksheet to verify that the MIN is working how you want, and then remove it from the worksheet (but don't delete it).
Also, substitute your actual item names for column_b and column_d.