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Earliest Start for Multiple Distinct Records

Posted on 2014-03-03
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Last Modified: 2014-05-02
Ok, I am not sure if I worded the title correctly.  I have looked at numerous examples on here and on SO, but nothing seems to work as they all have 'Where' clauses that I can't get to work.  

I have a table that has a date/time column.  I want to get the earliest time for each distinct item in another column.  Here, take a look at my data.

SQL Table
'Machine' is my distinct column.  You can see the highlighted records that I want it to return.  I want to get the orderNumber, Tool, and Color for each of the earliest dates.  I have tried numerous things, but nothing seems to really work.  Thank you for any help you can give me on this - it has been driving me crazy for days.
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Question by:G Scott
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Author Comment

by:G Scott
ID: 39900250
SELECT        *
FROM            (SELECT        *, ROW_NUMBER() OVER (PARTITION BY masch_nr
                          ORDER BY fulltime) rn
FROM            u_order_start_times) q
WHERE        rn = 1


That did it.  I will leave it here to help others.
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Expert Comment

by:Kevin Cross
ID: 39900293
I am glad you figured that out.  If you select your comment above as the solution, it will close the question (so the Experts understand you solved the problem); however, it will leave the topic available to help others.

With that in mind, here is a link for future readers that may help understand the solution.
http://www.experts-exchange.com/Microsoft/Development/MS_Access/A_1555-Analytical-SQL-Where-do-you-rank.html
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Expert Comment

by:Jim Horn
ID: 39900408
>I want to get the orderNumber, Tool, and Color for each of the earliest dates.
There's an article called SQL Server GROUP BY Solutions, where point #5 'Aggregate AND values from a single row that make up the aggregate:  Subquery' is a demo of exactly what you're trying to pull off.
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Expert Comment

by:Anthony Perkins
ID: 39902306
That did it.  I will leave it here to help others.
Ouch!  You may want to look into using a CTE in this case.  You may find that a tad more efficient and easier to read.
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Accepted Solution

by:
David Todd earned 500 total points
ID: 39902417
Hi,

select
    orderNumber, machine, Tool, Color , min( StartTime ) as EarliestDate
from dbo.u_order_start_times
group by
    orderNumber, machine, Tool, Color
;

HTH
  David
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