Re: delete cascade

From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 16 Apr 2007 01:25:05 GMT
Message-ID: <RfAUh.81613$6m4.37797@pd7urf1no>

paul c wrote:
> Bob Badour wrote:
>

>> paul c wrote:
>>
>>> I sometimes wonder why the above noun used in place of an adjective 
>>> is needed.    When the table/relation definition of a line item 
>>> references an invoice number can it mean anything other than that the 
>>> line item doesn't exist unless the invoice exists?  Ie., why 
>>> shouldn't delete always mean so-called "cascade"?
>>>
>>> (just trying to keep Marshall interested.)
>>>
>>> p
>>
>>
>>
>> Because some times it means: "If a line item exists, the invoice must 
>> also exist."

>
>
> Please forgive my thickness, but doesn't "line item doesn't exist
> unless..." (ie., "only if") "...the invoice exists" mean the same?
>
> p

Oh, let me try again to repair that clumsy re-phrase: "... exists only if ...".

p Received on Sun Apr 15 2007 - 20:25:05 CDT