Re: [SQL] Agregate Problem?

From: Herouth Maoz <herouth(at)oumail(dot)openu(dot)ac(dot)il>
To: "Len Morgan" <len-morgan(at)crcom(dot)net>, <pgsql-sql(at)postgreSQL(dot)org>
Subject: Re: [SQL] Agregate Problem?
Date: 1999-08-15 14:27:57
Message-ID: l03130309b3dc7e410a29@[147.233.159.109]
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-sql

At 17:01 +0300 on 15/08/1999, Len Morgan wrote:

>
> SELECT itemno,sum(qty) FROM sales WHERE sale_date = 'now()::date'
>
> I would expect to get back zero rows if there were no sales today but I get
> back 1. Of course I also get back 1 row if I only sold 1 item. Is this a
> bug or a "feature?"

This is a correct behaviour when there is no GROUP BY. PostgreSQL does this
in GROUP BY, too, unfortunately. But it's not a big problem - you merely
have to check whether the returned row has a NULL value instead of the sum.

Herouth

--
Herouth Maoz, Internet developer.
Open University of Israel - Telem project
http://telem.openu.ac.il/~herutma

In response to

Browse pgsql-sql by date

  From Date Subject
Next Message Ross J. Reedstrom 1999-08-15 15:36:26 Re: [SQL] Multiple values for a field
Previous Message Len Morgan 1999-08-15 14:01:36 Agregate Problem?