结束（分区）SQL-无结果

Question

I'm trying to use the over (partition) clause to select aa record that selects the record with the max (noteid).

First, when I run this query, I get the expected results which returns two records:

select driveid, text, noteid from rpt_notesdetail where driveid='628678'
and Reason in (select codeid from rpt_QuickCodes where DescShort like N'Publicity')

And I get DriveID: 628678, Text: All donors will receiv a Free T-shirt, Two Improv tickets and Jersey Mike's Sub Coupon!, NoteID: 1410233

DriveID : 628678, Text: All donors will receive a Free T-shirt, Two Improv tickets and Jersey Mike's Sub Coupon!, NoteID: 1410234

But when I try to use the over (partition) SQL:

(select text from (select (Text), noteid, max(noteid) over (partition by driveid) as 'max_note'
from rpt_NotesDetail 
where DriveID='628678' 
and createdate = (select max(createdate) from rpt_notesdetail where DriveID='628678') 
and Reason in (select codeid from rpt_QuickCodes where DescShort like N'Publicity')) AS A where A.noteid = A.max_note)

Which returns no results. Any advice on what I am missing here?

Answer 1

I think you're doing it the hard way. See if you like this way better, and it also allows you to better find the problem. I think it may be because you're not including "and noteid = ..." in your subselect for max(createdate).

(select text from 
(
select (Text), noteid, row_number() over (partition by driveid order by noteid desc) as row_num
from rpt_NotesDetail 
where DriveID='628678' 
and createdate = (select max(createdate) from rpt_notesdetail where DriveID='628678') 
and Reason in (select codeid from rpt_QuickCodes where DescShort like N'Publicity')
) AS A 
-- comment out this line to see all rows, possibly showing the data problem
where A.row_num = 1
)

Answer 2

Based on a suggestion from Tim Lehner, I placed the Reason subquery inside the createdate subquery and it works:

(select text from (select (Text), noteid, max(noteid) over (partition by driveid) as 'max_note'
from rpt_NotesDetail where DriveID="DriveMaster"."DriveID" and createdate =
(select max(createdate) from rpt_notesdetail where
DriveID="DriveMaster"."DriveID" and Reason in
(select codeid from rpt_QuickCodes where DescShort like N'Publicity'))) AS A
where A.noteid = A.max_note)