find max value of unique part numbers

[Guest]

I don't know the best way of asking this question, but here goes...

I have a primary data table that looks something like this:

Serial Number Date testvalue
0001 2/25/06 1000
0001 2/25/06 1234
0001 2/27/06 5675
0015 2/24/06 1534
0015 2/26/06 9521
0027 2/24/06 1699
0027 2/25/06 8640

Each serial number appears multiple times but with different testvalues. I
want a query that returns each serial number only once and with the maximum
of the test value for that serial number. Based on the above data the
desired result would look like:

Serial Number Date testvalue
0001 2/27/06 5675
0015 2/24/06 9521
0027 2/25/06 8640

How can I do this?

Rob

 

[tiger0268 via AccessMonster.com]

I don't know the best way of asking this question, but here goes...

I have a primary data table that looks something like this:

Serial Number Date testvalue
0001 2/25/06 1000
0001 2/25/06 1234
0001 2/27/06 5675
0015 2/24/06 1534
0015 2/26/06 9521
0027 2/24/06 1699
0027 2/25/06 8640

Each serial number appears multiple times but with different testvalues. I
want a query that returns each serial number only once and with the maximum
of the test value for that serial number. Based on the above data the
desired result would look like:

Serial Number Date testvalue
0001 2/27/06 5675
0015 2/24/06 9521
0027 2/25/06 8640

How can I do this?

Rob

I have a similar query:
Right click on the Date field and click on totals.
Select "Max" for the totals field.

 

[MGFoster]

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SELECT [Serial Number], [Date], testvalue As hi_value
FROM table_name As T
WHERE testvalue = (SELECT MAX(testvalue) FROM table_name
WHERE [serial number] = T.[serial number])

--
MGFoster:::mgf00 <at> earthlink <decimal-point> net
Oakland, CA (USA)

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