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help / color / mirror / Atom feedFrom: Tom Lane <tgl@sss.pgh.pa.us>
To: Oliver Elphick <olly@lfix.co.uk>
Cc: Marcin Wasilewski <marcingrupy@poczta.onet.pl>
Cc: pgsql-general@postgresql.org
Subject: Re: Order in CREATE VIEW
Date: Sat, 14 Apr 2001 04:08:14 -0400
Message-ID: <13487.987235694@sss.pgh.pa.us> (raw)
In-Reply-To: <200104140623.f3E6NqU29861@linda.lfix.co.uk>
References: <200104140623.f3E6NqU29861@linda.lfix.co.uk>
"Oliver Elphick" <olly@lfix.co.uk> writes:
> A view creates a virtual table; there is no implicit ordering in a table,
> so it follows that you should not be able to impose one in a view.
This is indeed the pure-SQL attitude, but it may be worth pointing out
that Postgres 7.1 does allow ORDER BY in subselects and views anyway.
The main reason that that seems like a good idea (IMHO at least) is that
ORDER BY together with LIMIT allow you to select specific rows in ways
that are difficult to accomplish otherwise.
regards, tom lane
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To: pgsql-general@postgresql.org
Cc: tgl@sss.pgh.pa.us, olly@lfix.co.uk, marcingrupy@poczta.onet.pl
Subject: Re: Order in CREATE VIEW
In-Reply-To: <13487.987235694@sss.pgh.pa.us>
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