From: Johan De Meersman (vegivamptuxera.be)
Date: Fri Dec 11 2009 - 06:43:52 CST

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On Fri, Dec 11, 2009 at 11:19 AM, Mark Goodge <markgood-stuff.co.uk> wrote:

> Jørn Dahl-Stamnes wrote:
>
>> On Friday 11 December 2009 10:38, Victor Subervi wrote:
>>
>>> Hi;
>>>
>>> mysql> update products set sizes="('Small', 'Large')" where ID=0;
>>> Query OK, 0 rows affected, 1 warning (0.00 sec)
>>> Rows matched: 1 Changed: 0 Warnings: 1
>>>
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> Look at the message, 0 rows changed and 1 warning.
>> You cannot have ID=0 if ID is an index.
>>
>
> You can, but not if it's an auto-increment field.
>

Also, not *entirely* correct, although you have to jump through a few hoops:
it can occur if the field was changed to auto_increment *after* the 0 was
put in there.

Yes, I inherited a database like that once, and yes, it fucks up your day.

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