From: Philippe Lang <philippe.lang@attiksystem.ch>
To: pgsql-sql@postgresql.org
Subject: Re: function expression in FROM may not refer to other relations of same query level
Date: Wed, 11 Aug 2004 10:24:42 +0200
Message-ID: <6C0CF58A187DA5479245E0830AF84F420803B4@poweredge.attiksystem.ch> (raw)
I found one solution:
select
id,
usr,
code,
(get_lines(code)).line1,
(get_lines(code)).line2
from tbl;
The problem now is that get_lines is being called twice per line. (I check with a RAISE NOTICE).
Philippe
-----Message d'origine-----
De : pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org] De la part de Philippe Lang
Envoyé : mercredi, 11. août 2004 08:41
À : pgsql-sql@postgresql.org
Objet : Re: [SQL] function expression in FROM may not refer to other relations of same query level
Hello,
> Whats wrong with just using CASE:
>
> select id, usr, code,
> case when code = 1 then 'A' else 'Z' end as line1,
> case when code = 1 then 'A' else 'Z' end as line2 from tbl;
The code I showed in my last mail was actually test code only. The logic is more complicated, and I'm not sure it's possible to implement it with a SELECT... CASE. What's more, the "get_lines" function already exists, and is already used in different parts of the database. I would like, if possible, to use it without changing it, or duplicating code.
Philippe
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To: pgsql-sql@postgresql.org
Cc: philippe.lang@attiksystem.ch
Subject: Re: function expression in FROM may not refer to other relations of same query level
In-Reply-To: <6C0CF58A187DA5479245E0830AF84F420803B4@poweredge.attiksystem.ch>
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