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強迫観念家裁研磨保証人
ashehu
1/21/2014 1:49:00 AM
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2 Answers
Jonathan Wood
1/17/2008 7:52:00 PM
0
Right. Thanks.
--
Jonathan Wood
SoftCircuits Programming
http://www.softci...
"Rick" <RickREMOVETHIS@LakeValleySeed.com> wrote in message
news:OEeyQATWIHA.1376@TK2MSFTNGP02.phx.gbl...
> Kerry,
>
> I realize it CAN be done, I was just saying I would do it differently so
> that a null FK never happens.
>
> Radek makes a good point that Inner and Outer Joins will never "loose"
> data because of a null FK.
>
> Anyway it is just a matter of personal preference and coding style.
>
> Rick
>
> "Jonathan Wood" <jwood@softcircuits.com> wrote in message
> news:e3DJ0j6VIHA.6044@TK2MSFTNGP05.phx.gbl...
>>I just wondered if anyone here has had experience with nullable foreign
>>keys.
>>
>> I have a number of items and I want some of the items associated with a
>> user while other items are not associated with any user. After thinking
>> about this, it seems like the easiest approach is to put all items in the
>> same table and give that table a foreign key to the user's table, but
>> allow that foreign key to be NULL for when the item is not associated
>> with a user.
>>
>> This seems pretty straight forward but there's a few things that bother
>> me. Just thought I'd check if anyone sees any potential problems to this
>> approach.
>>
>> Thanks.
>>
>> --
>> Jonathan Wood
>> SoftCircuits Programming
>>
http://www.softci...
>>
>
>
Jonathan Wood
1/17/2008 7:56:00 PM
0
Kerry,
> Surely in your database design course you were taught that the techinique
> you are describing is poor database design?
>
> This isn't any more a matter of personal preference than designing a table
> with repeating groups would be.
Perhaps you can be encouraged to address the specific problems that you see
with this approach. I do not see how this is the same as repeating
groups--what is being repeated? Why is this a problem, specifically? And how
would you address it?
--
Jonathan Wood
SoftCircuits Programming
http://www.softci...
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