From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Manfred Koizar <mkoi-pg@aon.at>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Christoph Haller <ch@rodos.fzk.de>
Cc: pgsql-sql@postgresql.org
Subject: Re: Efficient DELETE Strategies
Date: Wed, 12 Jun 2002 12:36:36 -0400 (EDT)
Message-ID: <200206121636.g5CGaaR04976@candle.pha.pa.us> (raw)
In-Reply-To: <es9eguk7ov9644qo4qd341ess8ip8o51ok@4ax.com>
Manfred Koizar wrote:
> On Tue, 11 Jun 2002 10:28:40 -0400, Tom Lane <tgl@sss.pgh.pa.us>
> wrote:
> >It would seem that
> >
> > DELETE [ FROM ] relation_expr [ alias_clause ]
> > [ FROM from_list ] where_clause
> >
> >is the syntax that would be most nearly compatible with MSSQL and MySQL.
> >Does Oracle have anything comparable?
>
> Oracle basically supports (with slight variations between releases
> 7/8/9):
> DELETE [FROM] { table
> | view
> | ( subquery )
> }
> [alias] [WHERE ...] [returning_clause]
>
> Informix (March 1997, 9.1?):
> DELETE FROM { table
> | ONLY ( table )
> | view
> | synonym
> | collection_derived_table
> }
> WHERE condition
>
> According to the "SQL Quick Syntax Guide" the WHERE clause is not
> optional. Does anybody know, if this is a documentation bug?
> "Guide to SQL, Syntax" (Feb 1998, v7.3, v8.2) says, the WHERE clause
> is optional, as we'd expect.
Informix in dbaccess prompts you if you do a DELETE with no WHERE to
make sure it is what you want, if I remember correctly. In app code,
the WHERE is optional. At least that is how I remember it.
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania 19026
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-sql@postgresql.org
Cc: pgman@candle.pha.pa.us, mkoi-pg@aon.at, tgl@sss.pgh.pa.us, ch@rodos.fzk.de
Subject: Re: Efficient DELETE Strategies
In-Reply-To: <200206121636.g5CGaaR04976@candle.pha.pa.us>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox