× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  • Subject: Re: sql comparison between records
  • From: "R. Bruce Hoffman, Jr." <rbruceh@xxxxxxxxxxxxx>
  • Date: Fri, 20 Jul 2001 14:47:37 -0400

Hey. Good question.

At first blush:

select a.key, avg(a.ts - (select min(b.ts) from theFile b where b.ts > a.ts
and a.key = b.key)) from theFile a group by a.key

but I can all but guarantee that that won't work.

Maybe with a common table expression or a view....

signed, pondering in pennsylvania....   ;-)


===========================================================
R. Bruce Hoffman, Jr.
 -- IBM Certified Specialist - AS/400 Administrator
 -- IBM Certified Specialist - RPG IV Developer

"America is the land that fought for freedom and then
  began passing laws to get rid of it."

     - Alfred E. Neuman

-----Original Message-----
From: Joel Fritz <JFritz@sharperimage.com>
To: MIDRANGE-L@midrange. com (E-mail) <MIDRANGE-L@midrange.com>
Date: Friday, July 20, 2001 1:20 PM
Subject: sql comparison between records


>How do you do this in SQL?
>
>I have a file ordered by key value and a timestamp.  There are multiple
>records for each key value. I want to find the difference between time
>stamps of successive records and calculate the average difference for a key
>value group.  I know, it's easy in RPG.  I'm not trying to measure
>programmer productivity. <g>
>+---
>| This is the Midrange System Mailing List!
>| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
>| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
>| To unsubscribe from this list send email to
MIDRANGE-L-UNSUB@midrange.com.
>| Questions should be directed to the list owner/operator:
david@midrange.com
>+---

+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.