SQL Selecting multiple columns based on max value in one column

Question

OK so I have looked theough the other solutions an no help. So here is what I am trying to do. I need to select the row with multiple columns where the value in one column is the max value.

here is sample data

    orderfileid item number item cost   warehouse
    1           1234        3.45             ATL
    1           2345        1.67             DFW
    3           2345        2.45             NYY
    3           678         2.4              ORD
    2           1234        1.67             DFW

I need to select the entire row where the orderfileid is the max for each unique item number

the returned dataset should look like

    orderfileid item number item cost   warehouse
    2           1234        1.67             DFW
    3           2345        2.45             NYY
    3           6789        2.4              ORD

I think i tried every combination of select max(orderfileid) i can think of

Any help would be appriciated. thanks

Answer 1

You need to find your MAX values in a subquery, then use those results to join to your main table to retrieve the columns.

SELECT t.OrderFileId, t.ItemNumber, t.ItemCost, t.Warehouse
    FROM YourTable t
        INNER JOIN (SELECT ItemNumber, MAX(OrderFileId) AS MaxOrderId
                        FROM YourTable
                        GROUP BY ItemNumber) q
            ON t.ItemNumber = q.ItemNumber
                AND t.OrderFileId = q.MaxOrderId