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Re: delete cascade

From: paul c <toledobythesea_at_oohay.ac>
Date: Mon, 16 Apr 2007 01:09:57 GMT
Message-ID: <F1AUh.81441$DE1.56905@pd7urf2no>


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 Received on Sun Apr 15 2007 - 20:09:57 CDT

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