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Message-ID: <6bdfe880612150521n137d80f7q463955f26db1cef0@mail.gmail.com>
Date: Fri, 15 Dec 2006 19:21:36 +0600
From: "Partha Guha Roy" <partha.guha.roy@gmail.com>
To: "Richard Broersma Jr" <rabroersma@yahoo.com>
Subject: Re: Need to subtract values between previous and current row
Cc: pgsql-sql@postgresql.org
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Hi,

Thanks for everyones email. Let me clarify a little bit more.

Actually there is a state change of an entity. now the results are stored in
the following manner:

CID        ATIME          STATE
101        12/10/2006     1
101        12/12/2006     2
101        12/14/2006     1
101        12/17/2006     2
102        12/14/2006     1
102        12/16/2006     2
102        12/18/2006     3

Now I have to find which CID stayed on which STATE for how long.

Lets assume today is the 20th.
So the result would be:

CID      DURATION      STATE
101      2                     1
101      2                     2
101      3                     1
101      3                      2
102      2                     1
102      2                     2
102      2                     3

The constraints are:
I can't use any plpgsql or other function.
There can be gaps in CID.
No sequence can be created.

Thanks.


On 12/15/06, Richard Broersma Jr <rabroersma@yahoo.com> wrote:
>
> >
> > ID           ATIME (MM/dd/yyyy)
> > ==          ====
> > 1            10/12/2006
> > 2            10/14/2006
> > 3            10/18/2006
> > 4            10/22/2006
> > 5            10/30/2006
> >
> > Now I need a query that will subtract atime of row 1 from row 2, row2
> from
> > row3  and so on...
>
> just an idea.
>
> select (A.atime - max(B.atime)) duration
> from table A join table B
> on (A.atime > B.atime)
> group by A.atime;
>
> Regards,
> Richard Broersma Jr.
>



-- 
------------------------------
Partha Guha Roy
***********************************************
Take everything you like seriously, except yourselves.
- Rudyard Kipling

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Hi,<br><br>Thanks for everyones email. Let me clarify a little bit more.<br><br>Actually there is a state change of an entity. now the results are stored in the following manner:<br><br>CID&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ATIME&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; STATE<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/10/2006&nbsp;&nbsp;&nbsp;&nbsp; 1
<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/12/2006&nbsp;&nbsp;&nbsp;&nbsp; 2<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/14/2006&nbsp;&nbsp;&nbsp;&nbsp; 1<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/17/2006&nbsp;&nbsp;&nbsp;&nbsp; 2<br>102 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/14/2006&nbsp;&nbsp;&nbsp;&nbsp; 1<br>102 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/16/2006&nbsp;&nbsp;&nbsp;&nbsp; 2<br>102 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 12/18/2006&nbsp;&nbsp;&nbsp;&nbsp; 3<br><br>Now I have to find which CID stayed on which STATE for how long.
<br><br>Lets assume today is the 20th.<br>So the result would be:<br><br>CID&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DURATION&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; STATE<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br>101&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2
<br>102&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  1<br>102&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2<br>102&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<br><br>The constraints are:<br>I can't use any plpgsql or other function.<br>There can be gaps in CID.<br>No sequence can be created.
<br><br>Thanks.<br><br><br><div><span class="gmail_quote">On 12/15/06, <b class="gmail_sendername">Richard Broersma Jr</b> &lt;<a href="mailto:rabroersma@yahoo.com">rabroersma@yahoo.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
&gt;<br>&gt; ID&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ATIME (MM/dd/yyyy)<br>&gt; ==&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;====<br>&gt; 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10/12/2006<br>&gt; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10/14/2006<br>&gt; 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10/18/2006<br>&gt; 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10/22/2006<br>&gt; 5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;10/30/2006
<br>&gt;<br>&gt; Now I need a query that will subtract atime of row 1 from row 2, row2 from<br>&gt; row3&nbsp;&nbsp;and so on...<br><br>just an idea.<br><br>select (A.atime - max(B.atime)) duration<br>from table A join table B<br>on (
A.atime &gt; B.atime)<br>group by A.atime;<br><br>Regards,<br>Richard Broersma Jr.<br></blockquote></div><br><br clear="all"><br>-- <br>------------------------------<br>Partha Guha Roy<br>***********************************************
<br>Take everything you like seriously, except yourselves.<br>- Rudyard Kipling

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