Question

I recently asked this question here and got some great answers!
Custom SQL GROUP BY Clause

However, it turns out I provided the wrong requirements for my problem. Sorry guys!

Sooooo. What I need to select is:

Distinct values in the Column ‘PartNumbers’, however:

–>For EACH unique PartNumber, I want to select the specific ROW from that table that has the MAX VALUE of the ‘PO’ Column for that particular part number.

–>Also, to make life more difficult, I want to exclude the ANY of the PartNumbers who have ANY VALUE in the Column ‘Receipt’

You guys have been a great help! Much appreciated everyone!

EDIT:

Table Name: Log

Columns: ID, Supplier, PartNumber, PO, Quantity, DateReceived

Note: only the ID column is unique.

Answer 1

Using CTE:

with TableWithRowNumber as
    (select 
        *,
        row_number() over (partition by PartNumber order by PO desc) as RowNo
    from MyTable)   
select * from TableWithRowNumber 
where RowNo = 1
and PartNumber not in 
    (select distinct PartNumber from MyTable where Receipt is not null)