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SQL Query - Where Clause Question

Posted on 2015-01-13
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Last Modified: 2015-01-15
I have a table that I am querying some tables from and wanting to pull the last date.  However, sometimes this date is the same.   Example, a PO that was last received on the same day for same Item.

How could I create my query that if the "Received_Date" is the same, then look at the "Want_Date" instead?

Example
select item_id, Unit_price, Want_date, Received_date
from  PO_Line

Not sure how to tweak the above query that if "Received_Date" is the same, then look at "Want_date" and only pull the most recent.  Any ideas?
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Question by:holemania
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4 Comments
 
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Accepted Solution

by:
Scott Pletcher earned 2000 total points
ID: 40547919
SELECT [Item ID], [Unit Price], [Want_Date], [Received_Date], ...
FROM (
    SELECT *, ROW_NUMBER() OVER ( PARTITION BY /*PO_Number,*/ [Item ID] ORDER BY Received_Date DESC, Want_Date DESC ) AS row_num
    FROM PO_Line
) AS derived
WHERE
    row_num = 1
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LVL 5

Expert Comment

by:Leon Kammer
ID: 40547921
Hi,

Could just be that it is late, but could you clarify the question please, I am having rouble understanding what you want the query to accomplish.

if "Received_Date" is the same, then look at "Want_Date".

(If the Received_Date colum is identical to the Want_Date, or if there are multiple records returned for the item ID for that date?)

Cheers

Leon
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Author Comment

by:holemania
ID: 40549544
Leon,

I'll look at what Scott suggested, but I am pulling some data off a table.  Sometimes, the "received date" is the same, and I want to pull the most recent "received date".  Since I can have 2 or more records received on same date, then I am told to use the "want date" as the next filter.  

The example above, I have 2 PO that was received on the same date.  Now I need to then look at the "want date".
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Author Closing Comment

by:holemania
ID: 40551310
Thank you.  That worked.
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