Re: Natural keys vs Aritficial Keys
From: Bob Badour <bbadour_at_pei.sympatico.ca>
Date: Thu, 28 May 2009 18:14:45 -0300
Message-ID: <4a1efeb8$0$23737$9a566e8b_at_news.aliant.net>
>> "David BL" <davidbl_at_iinet.net.au> wrote in message
>> news:f20bd044-adea-41d5-b301-9dd0f57ed736_at_z16g2000prd.googlegroups.com...
>>
>>> The ORM idea makes the blunder because it assumes incorrectly that the
>>> values within a set can be identified independently of their value.
>>> ORM wants to make this assumption so that a variable that records a
>>> set of values can instead be interpreted as a set of variables.
>>
>> The last several exchanges in this thread have gone over my head. Oddly
>> enough, this last paragraph brings the discussion full circle, back to
>> where
>> I started.
>>
>> Consider a set of tuples. Or maybe a set of current states of
>> tuple-variables. (That's the part that's over my head.)
Date: Thu, 28 May 2009 18:14:45 -0300
Message-ID: <4a1efeb8$0$23737$9a566e8b_at_news.aliant.net>
paul c wrote:
> Walter Mitty wrote: >
>> "David BL" <davidbl_at_iinet.net.au> wrote in message
>> news:f20bd044-adea-41d5-b301-9dd0f57ed736_at_z16g2000prd.googlegroups.com...
>>
>>> The ORM idea makes the blunder because it assumes incorrectly that the
>>> values within a set can be identified independently of their value.
>>> ORM wants to make this assumption so that a variable that records a
>>> set of values can instead be interpreted as a set of variables.
>>
>> The last several exchanges in this thread have gone over my head. Oddly
>> enough, this last paragraph brings the discussion full circle, back to
>> where
>> I started.
>>
>> Consider a set of tuples. Or maybe a set of current states of
>> tuple-variables. (That's the part that's over my head.)
That's the blunder right there, Walter. Tuples are not variables. Tuples are values. Received on Thu May 28 2009 - 23:14:45 CEST