From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | depesz(at)depesz(dot)com |
Cc: | Lon Varscsak <varscsak(at)smarthealth(dot)com>, pgsql-bugs(at)postgresql(dot)org |
Subject: | Re: BUG #4220: delete statement deleted too many rows |
Date: | 2008-06-04 20:08:09 |
Message-ID: | 28896.1212610089@sss.pgh.pa.us |
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Lists: | pgsql-bugs |
hubert depesz lubaczewski <depesz(at)depesz(dot)com> writes:
> On Wed, Jun 04, 2008 at 06:46:42PM +0000, Lon Varscsak wrote:
>> delete from customer_transactions_detail where transaction_id in (select
>> transaction_id from test);
>> The transaction_id column does NOT exist in the temporary table named
>> 'test'). I would think this would just result in an error, instead it
>> delete all rows in the customer_transactions_detail table.
> i wrote about it in more details in here:
> http://www.depesz.com/index.php/2007/09/06/postgresql-gotchas/
This isn't a "postgres gotcha", it's a "SQL standard gotcha". Any DBMS
that fails to execute the query exactly that way is violating the spec.
regards, tom lane
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