From: Tom Lane <tgl@sss.pgh.pa.us>
To: Elías David <elias.moreno.tec@gmail.com>
Cc: pgsql-admin <pgsql-admin@postgresql.org>
Subject: Re: Default order of select datname from pg_database
Date: Sat, 19 Apr 2014 11:17:35 -0400
Message-ID: <24744.1397920655@sss.pgh.pa.us> (raw)
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=?UTF-8?B?RWzDrWFzIERhdmlk?= <elias.moreno.tec@gmail.com> writes:
> By any change, does the following query have an "order by" by default when
> omitted?:
> select datname from pg_database;
No. No SQL query ever has a "default" order by.
> I executed that query against one of my servers and while looking at the
> names it seems complety random, the order is always the same, for instance:
An unqualified query is typically going to result in a sequential scan
of the table, so what you're seeing is the current physical order of the
tuples. This might change after adding/deleting/changing the properties
of a database.
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, elias.moreno.tec@gmail.com
Subject: Re: Default order of select datname from pg_database
In-Reply-To: <24744.1397920655@sss.pgh.pa.us>
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