From: | Manfred Koizar <mkoi-pg(at)aon(dot)at> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Christoph Haller <ch(at)rodos(dot)fzk(dot)de>, pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Efficient DELETE Strategies |
Date: | 2002-06-12 14:03:39 |
Message-ID: | es9eguk7ov9644qo4qd341ess8ip8o51ok@4ax.com |
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Lists: | pgsql-sql |
On Tue, 11 Jun 2002 10:28:40 -0400, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)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.
Servus
Manfred
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