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

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