| From: | Linos <info(at)linos(dot)es> |
|---|---|
| To: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | question about query |
| Date: | 2011-06-30 13:00:02 |
| Message-ID: | 4E0C7352.7030401@linos.es |
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| Lists: | pgsql-general |
Hi,
i am trying to obtain from the database what we have been doing in a excel
sheet from some time.
I have some tables where i store the documents associated with our customers,
invoices, payments and others, what i need to get from this tables it is a
movement log where i can get what payment it is pending from this customer after
the change in this row, for example:
movement | qty | pending
invoice N-111 | 1000.0 | 1000.0
payment 1 N-111 | 200.0 | 800.0
payment 1 N-111 | 150.0 | 550.0
invoice N-112 | 350.0 | 900.0
how could i calculate this pending column that does not exists in the database
and i need to be based on last result row? I would like to get with raw SQL but
the need to use any procedural language would not be a problem.
Thanks!
Regards,
Miguel Angel.
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