From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: Andreas <maps.on@gmx.net>
Cc: Andrei Bintintan <klodoma@ar-sd.net>
Cc: pgsql-sql@postgresql.org
Subject: Re: where to start with this procedure ?
Date: Thu, 20 May 2004 08:01:52 -0700 (PDT)
Message-ID: <20040520075846.W14089@megazone.bigpanda.com> (raw)
In-Reply-To: <40ACC4CA.4080406@gmx.net>
References: <40ABFCDE.8020601@gmx.net>
<00bb01c43e3a$7d33f980$0b00a8c0@forge>
<40ACC4CA.4080406@gmx.net>
On Thu, 20 May 2004, Andreas wrote:
>
> Hi Andrei,
>
>
> >Use the Offset and Limit in the SQL query.
> >[...]
> >SELECT select_list
> > FROM table_expression
> > WHERE condition
> > LIMIT 50
> > OFFSET 10000
> >
> >This query will return 50 elements starting with the 10000 elements... so
> >the elemenst from 10000 to 10050.
> >
> >
>
> That isn't the issue since I only need a specific few of the lines at all.
> I need a dynamic WHERE clause.
>
> It's more like this :
> SELECT customer_id, and, some, more, fields
> FROM table1
> JOIN table2
> JOIN table3
> ....
>
> This results in the "huge" set.
> On the Access-form I only need the orders, or contact history for 1
> customer.
>
> As of now I only know 2 ways to solve this.
> 1) Load all the tables over the net into Access and let the JOIN run
> locally. That way I can filter dynamically by adding a WHERE
> customer_id = x to the select above.
Why not add the where clause to the select that goes to the server?
In any case, you can do a function that does the select with a condition
fairly easily with a set returning function in recent versions I think.
Make a composite type with the return fields (create type <name> as (...))
then make an sql function that takes an integer returns setof <name> that
selects from table1 join table2 ... where customer_id = $1.
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone.bigpanda.com, maps.on@gmx.net, klodoma@ar-sd.net
Subject: Re: where to start with this procedure ?
In-Reply-To: <20040520075846.W14089@megazone.bigpanda.com>
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