From: | Rob Sargent <robjsargent(at)gmail(dot)com> |
---|---|
To: | Richard Huxton <dev(at)archonet(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: psql can't subtract |
Date: | 2011-03-25 16:30:30 |
Message-ID: | 4D8CC326.8070508@gmail.com |
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Thread: | |
Lists: | pgsql-general |
On 03/25/2011 09:57 AM, Richard Huxton wrote:
> On 25/03/11 15:29, Rob Sargent wrote:
>> Running 9.0.3 (client and server)
>
>> select distinct
>> substring(
> ...
>> position( 'xmlns=' in substring(xml_text,1,300)) + length('xmlns="'),
>> 100))) -1
> ...
>> gives
>> ERROR: negative substring length not allowed.
>
> If there is no match the initial position will be zero. Minus one will
> give you a negative substring length.
>
Of course. One lousy malformed input record. The speed at which the
failure occurred lead me to think it was a parsing issue. Turns out the
bogus record was "near the front of the queue".
Thanks
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