From: Michele Petrazzo - Unipex <michele.petrazzo@unipex.it>
To: Oliveiros d'Azevedo Cristina <oliveiros.cristina@marktest.pt>
Cc: pgsql-sql@postgresql.org
Subject: Re: all the table values equal
Date: Tue, 21 Sep 2010 10:11:23 +0200
Message-ID: <4C9868AB.6050200@unipex.it> (raw)
In-Reply-To: <81C545E3469E4DF58720C282A469E78A@marktestcr.marktest.pt>
References: <4C93803A.4080706@unipex.it>
<438B32316EF6496D9641819BA16447A2@marktestcr.marktest.pt>
<4C938D09.3050105@unipex.it>
<81C545E3469E4DF58720C282A469E78A@marktestcr.marktest.pt>
Oliveiros d'Azevedo Cristina ha scritto:
> Hello again, Michele,
>
Ciao,
> I haven't open my mailbox during weekend so I couldn't follow up your
> question.
>
No problem!
> It would help if you explain a little better the background of the
> problem you're trying to solve.
>
> You want to find all the user IDs which have the same value on a
> given time interval?
>
> Is my understanding correct?
>
Yes.
Re-reading my post I saw that I could explain better!
id_user | value | datetime
1 | 1 | xxx
1 | 2 | xxx+1
1 | -1 | xxx+2
2 | -1 | xxx
2 | -1 | xxx+1
3 | 4 | xxx
3 | 10 | xxx+1
3 | 4 | xxx+2
4 | 3 | xxx
4 | 3 | xxx+1
So, the new question: how I can find which id_user has _all_ the "value"
that I'm looking for? Say -1 as 3 and I want a id_user=2 for the first
and for the latter id_user=4
Thanks,
Michele
> Best, Oliver
>
> ----- Original Message ----- From: "Michele Petrazzo - Unipex"
> <michele.petrazzo@unipex.it> To: "Oliveiros d'Azevedo Cristina"
> <oliveiros.cristina@marktest.pt> Cc: <pgsql-sql@postgresql.org> Sent:
> Friday, September 17, 2010 4:45 PM Subject: Re: [SQL] all the table
> values equal
>
>
>> Oliveiros d'Azevedo Cristina ha scritto:
>>> Howdy , Michele,
>>>
>>> Give this a try
>>>
>>> SELECT id_user FROM t_your_table WHERE datetime BETWEEN A --
>>> plug here beginning of interval AND B -- and end here GROUP BY
>>> id_user HAVING COUNT(*) = -SUM(value)
>>>
>>> Then tell me if it gives you what you want
>>
>>
>> Thanks, it works, but... it's really a trickle that exploits the
>> value -1 if I understand how its work. If there is another value
>> where look for? Example 13?
>>
>> Thanks
>>
>> -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To
>> make changes to your subscription:
>> http://www.postgresql.org/mailpref/pgsql-sql
>
>
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Subject: Re: all the table values equal
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