Solved

Earliest Start for Multiple Distinct Records

Posted on 2014-03-03
5
145 Views
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.
0
Comment
Question by:G Scott
5 Comments
 
LVL 1

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.
0
 
LVL 59

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
0
 
LVL 65

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.
0
 
LVL 75

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.
0
 
LVL 35

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
0

Featured Post

Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
export sql results to csv 6 48
Index and Stats Management-Specific tables 8 38
Many to one in one row 2 35
Checking for column changes SQL 2014 4 16
In this article we will get to know that how can we recover deleted data if it happens accidently. We really can recover deleted rows if we know the time when data is deleted by using the transaction log.
Ever needed a SQL 2008 Database replicated/mirrored/log shipped on another server but you can't take the downtime inflicted by initial snapshot or disconnect while T-logs are restored or mirror applied? You can use SQL Server Initialize from Backup…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question