From: Richard Huxton <dev@archonet.com>
To: Philippe Lang <philippe.lang@attiksystem.ch>
To: pgsql-sql@postgresql.org
Subject: Re: sub-select parameter problem
Date: Thu, 4 Mar 2004 11:51:21 +0000
Message-ID: <200403041151.21946.dev@archonet.com> (raw)
In-Reply-To: <6C0CF58A187DA5479245E0830AF84F42080222@poweredge.attiksystem.ch>
References: <6C0CF58A187DA5479245E0830AF84F42080222@poweredge.attiksystem.ch>
On Thursday 04 March 2004 11:20, Philippe Lang wrote:
[working query]
> It works fine.
Excellent! :-)
Oh - there's more :-(
> Now, I need to do something else: the parameter of my sub-select is also
> a member of the table I'm selecting.
>
> SELECT
>
> tableA.field1,
> tableA.field2,
>
> tableB.field1,
> tableB.field2,
>
> (
> SELECT tableB.field2
> FROM tableB
> WHERE tableB.field1 = tableB.field1 (--> from-main-select?) - 1;
> ) AS p
>
> FROM tableA
> INNER JOIN tableB
> ON tableA.pk = tableB.FK;
> -------------------------------------------
>
> How can I refer to the tableB.field1 parameter from the main query? I've
> tried to do something like this, but without success:
You're along the right lines, except I think you want to alias the table not
the column.
...
(
SELECT x.field2
FROM tableB AS x
WHERE x.field1 = tableB.field1 - 1
)
...
HTH
--
Richard Huxton
Archonet Ltd
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To: pgsql-sql@postgresql.org
Cc: dev@archonet.com, philippe.lang@attiksystem.ch
Subject: Re: sub-select parameter problem
In-Reply-To: <200403041151.21946.dev@archonet.com>
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