Date: Mon, 2 Dec 2002 14:23:21 -0500
From: Joel Burton <joel@joelburton.com>
To: Casey Allen Shobe <cshobe@osss.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: Combining queries while preserving order in SQL - Help!
Message-ID: <20021202192321.GA13619@temp.joelburton.com>
References: <200212021346.38338.cshobe@osss.net>
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On Mon, Dec 02, 2002 at 01:46:38PM -0500, Casey Allen Shobe wrote:
> Hi there,
> 
> I need to do the following in one SQL query:
> 
> select field1, field2, field3, field4, field5 from table where field6 < 5
> order by field1
> 
> And a totals line which shows the sum for each column.
> 
> The important part is that I need to preserve the order by of the first query.
> 
> Is there any way to do this in one query?

create table foo (a int, b int, c int );
insert into foo values (1,2,3);
insert into foo values (4,5,6);

select '' as label, 
       * 
from   foo 
union all 
select 'TOTAL', 
       sum(a), 
       sum(b),
       sum(c) 
from   foo 
order by 1,2;

(you wouldn't need the label column to sort by, except that a might
contain negative numbers, so the sum might be _less_ than some/all of
the numbers. by first sorting on this junk column, we can force the
totals at the bottom).

p.s. don't forget the "union __all__", otherwise you'll get rid of
duplicate entries in the your table.

-- 

Joel BURTON  |  joel@joelburton.com  |  joelburton.com  |  aim: wjoelburton
Independent Knowledge Management Consultant