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_at_pd7urf1no>
>
>
> Please forgive my thickness, but doesn't "line item doesn't exist
> unless..." (ie., "only if") "...the invoice exists" mean the same?
>
> p
Date: Mon, 16 Apr 2007 01:25:05 GMT
Message-ID: <RfAUh.81613$6m4.37797_at_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 Mon Apr 16 2007 - 03:25:05 CEST