From: Bruno Wolff III <bruno@wolff.to>
To: pgsql-sql@postgresql.org
Subject: Re: unique index on function and column
Date: Tue, 25 Jun 2002 13:45:58 -0500
Message-ID: <20020625184558.GA11367@wolff.to> (raw)
In-Reply-To: <9830.1025030116@sss.pgh.pa.us>
References: <20020625175828.GA11107@wolff.to>
<9830.1025030116@sss.pgh.pa.us>
On Tue, Jun 25, 2002 at 14:35:16 -0400,
Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Bruno Wolff III <bruno@wolff.to> writes:
> > Is there a simple way to do something like the following:
> > create unique index inst_u_app on inst (lower(host), psport);
>
> > It looks like you can have an index on several columns, but not
> > several functions.
>
> The standard answer is to make a custom function that accepts all the
> columns and produces a result you can index.
>
> This is sort of an academic "an existence proof is good enough" answer,
> but it *is* possible to get the results you want. Making it more
> convenient hasn't risen to the top of anyone's to-do list.
It probably isn't worth the trouble in this case. The number of rows is small
and I will use a unique index without forcing a case independpent comparison.
For the time being this is good enough.
Thanks for confirming that I was reading the manually correctly.
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To: pgsql-sql@postgresql.org
Cc: bruno@wolff.to
Subject: Re: unique index on function and column
In-Reply-To: <20020625184558.GA11367@wolff.to>
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