Max Date Function

Question

Hi,
I have the following columns in a report:
Vendor Name
Trade date
Prod Desc
Order Type
Qty
Gross Amt
I need to display only those rows where trade date = max(trade date).
I am aware of the MAX analytic function, but it keeps giving me an error.
Could someone please let me know how to achieve this scenario.
Thanks.

Answer 1

Hi
As pupppethead mentioned, it doesn't look as though you need a PARTITION BY clause.
A straight MAX(Trade Date) OVER () = Trade Date should suffice. The OVER() tells Discoverer to look at all dates in the query. You will only need a PARTITION BY if you are using Page Items or Group Sorts and you wanted a different date in each set.
By the way, as a word of warning, be very careful not to name items in folders or workbooks using Oracle reserved words. Naming an item as Desc is dangerous because that is the name of the descending switch in an ORDER BY clause of an analytic function. Thus, if you have for example something called ITEM DESC and try to do this:
RANK() OVER(ORDER BY ITEM DESC) you will have serious problems because the database (not Discoverer) will think you want to sort ITEM descending. Either ITEM does not exist and you will get an error or it does exist and you will end up with the sort on the wrong item.
Imagine also if you named something ORDER BY and then place this in a PARTITION BY clause like this:
MAX(Trade Date) OVER (PARTITION BY ORDER BY)
Interesting conundrum, don't you think?
Best wishes
Michael