| From: | Bruno Wolff III <bruno(at)wolff(dot)to> |
|---|---|
| To: | John Siracusa <siracusa(at)mindspring(dot)com> |
| Cc: | Postgres General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Adding missing FROM clause - thanks or no thanks? |
| Date: | 2004-01-27 18:28:03 |
| Message-ID: | 20040127182803.GA6328@wolff.to |
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| Lists: | pgsql-general |
On Tue, Jan 27, 2004 at 13:00:15 -0500,
John Siracusa <siracusa(at)mindspring(dot)com> wrote:
>
> Anyway, I fixed the query construction bug, but I have a question: is this
> "adding missing FROM-clause entry" behavior part of the SQL standard(s) or a
> "feature" of Postgres? Prior to seeing this, I'd have expected a query like
> the above to cause a fatal error in the parsing stage. Put another way, can
> someone give me an example of when this behavior is useful or desirable?
It is an extension. I think starting with 7.4 you can turn it off.
It is sort of useful for delete where there isn't a syntax to specify
addition tables, though I think you can get the same functionality
even there using subselects in the where clause.
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