On Mon, 14 Aug 2006, Eric Stadtherr wrote:
Thomas,
I wouldn't put the cascade delete on the type constraint, though (you
don't want to lose the ability to enter phone numbers just because you
deleted your last phone number... Wink ).
On CASCADE means that if you eliminate or update a PK, it will cascade to
the refereced keys. If you eliminate the last phone number, you're just
eliminating rows that reference th PK, so no CASCADE is done.
Those CASCADE are more like, if you eliminate the contact, all the info of
that contact will be eliminated.
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Lic. Martín Marqués | SELECT 'mmarques' ||
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