How do I get the max from a partitioned query using Rank () - tsql

Question

I want the result to return the max Rank when partitioned using the rank function.
I am using the following query.
SELECT DISTINCT dbo.pomst.co_num
,dbo.pomst.wh_num
,dbo.pomst.po_number
,dbo.pomst.po_suffix
,dbo.pomst.vendor_id
,dbo.item.uom
,dbo.item.upc_num
,dbo.item.item_desc
,RIGHT(dbo.auditlog.pallet_id, 8) AS pallet_id
,dbo.auditlog.abs_num
,dbo.auditlog.item_qty
,dbo.auditlog.lot
,dbo.auditlog.packer
,auditlog.comments
,auditlog.date_time
,rank() OVER (
PARTITION BY auditlog.comments ORDER BY auditlog.date_time ASC
) AS CorrectTrans
FROM dbo.auditlog
INNER JOIN dbo.pomst ON dbo.auditlog.co_num = dbo.pomst.co_num
AND dbo.auditlog.wh_num = dbo.pomst.wh_num
AND dbo.auditlog.po_number = dbo.pomst.po_number
AND dbo.auditlog.po_suffix = dbo.pomst.po_suffix
INNER JOIN dbo.item ON dbo.auditlog.co_num = dbo.item.co_num
AND dbo.auditlog.wh_num = dbo.item.wh_num
AND dbo.auditlog.abs_num = dbo.item.abs_num
WHERE (dbo.pomst.co_num = 'AC01')
AND (dbo.pomst.wh_num = 'KU22')
AND (dbo.pomst.row_status = 'C')
AND (dbo.auditlog.trans_type = 're')
AND item_qty NOT LIKE '-%'

Answer 1

I figured it out! I was trying to get the max result of a rank, but if I flip order of rank from asc to desc and use a CTE I can select the the results that always have 1 as the rank as opposed to trying to get the Max. I would still like to know how to get the Max rank but this solution suits my needs.
;with cte as
(SELECT DISTINCT dbo.pomst.co_num
,dbo.pomst.wh_num
,dbo.pomst.po_number
,dbo.pomst.po_suffix
,dbo.pomst.vendor_id
,dbo.item.uom
,dbo.item.upc_num
,dbo.item.item_desc
,RIGHT(dbo.auditlog.pallet_id, 8) AS pallet_id
,dbo.auditlog.abs_num
,dbo.auditlog.item_qty
,dbo.auditlog.lot
,dbo.auditlog.packer
,auditlog.comments
,auditlog.date_time
,rank() OVER (
PARTITION BY auditlog.comments ORDER BY auditlog.date_time desc
) AS CorrectTrans
FROM dbo.auditlog
INNER JOIN dbo.pomst ON dbo.auditlog.co_num = dbo.pomst.co_num
AND dbo.auditlog.wh_num = dbo.pomst.wh_num
AND dbo.auditlog.po_number = dbo.pomst.po_number
AND dbo.auditlog.po_suffix = dbo.pomst.po_suffix
INNER JOIN dbo.item ON dbo.auditlog.co_num = dbo.item.co_num
AND dbo.auditlog.wh_num = dbo.item.wh_num
AND dbo.auditlog.abs_num = dbo.item.abs_num
WHERE (dbo.pomst.co_num = 'AC01')
AND (dbo.pomst.wh_num = 'KU22')
AND (dbo.pomst.row_status = 'C')
AND (dbo.auditlog.trans_type = 're')
AND item_qty NOT LIKE '-%'
)
Select * from cte
where CorrectTrans = 1

Answer 2

Add select and group by and use your existing query as a sub query.
Try ..
select max([CorrectTrans]), Vendor_Id, Item_qty, Lot, Pallet_id
from (
-- Your existing query --
SELECT DISTINCT dbo.pomst.co_num
,dbo.pomst.wh_num
,dbo.pomst.po_number
,dbo.pomst.po_suffix
,dbo.pomst.vendor_id
,dbo.item.uom
,dbo.item.upc_num
,dbo.item.item_desc
,RIGHT(dbo.auditlog.pallet_id, 8) AS pallet_id
,dbo.auditlog.abs_num
,dbo.auditlog.item_qty
,dbo.auditlog.lot
,dbo.auditlog.packer
,auditlog.comments
,auditlog.date_time
,rank() OVER (
PARTITION BY auditlog.comments ORDER BY auditlog.date_time ASC
) AS CorrectTrans
FROM dbo.auditlog
INNER JOIN dbo.pomst ON dbo.auditlog.co_num = dbo.pomst.co_num
AND dbo.auditlog.wh_num = dbo.pomst.wh_num
AND dbo.auditlog.po_number = dbo.pomst.po_number
AND dbo.auditlog.po_suffix = dbo.pomst.po_suffix
INNER JOIN dbo.item ON dbo.auditlog.co_num = dbo.item.co_num
AND dbo.auditlog.wh_num = dbo.item.wh_num
AND dbo.auditlog.abs_num = dbo.item.abs_num
WHERE (dbo.pomst.co_num = 'AC01')
AND (dbo.pomst.wh_num = 'KU22')
AND (dbo.pomst.row_status = 'C')
AND (dbo.auditlog.trans_type = 're')
AND item_qty NOT LIKE '-%'
-- =======================================
) x
group by Vendor_id, Item_qty, Lot, Pallet_id