Meaning of 1:1, 1:1 generalization, 1:n, 1:n non identifying, n:m
From: Joshua Beall <jbeall_at_donotspam.remove.me.heraldic.us>
Date: Thu, 30 Sep 2004 21:30:31 GMT
Message-ID: <XV_6d.36$5R6.20_at_trnddc09>
Hi All,
Date: Thu, 30 Sep 2004 21:30:31 GMT
Message-ID: <XV_6d.36$5R6.20_at_trnddc09>
Hi All,
I've been taking a look at DB Designer 4, and looking through the documentation (http://www.fabforce.net/dbdesigner4/doc/index.html) I am a little unclear on some of their nomenclature:
'1:1' - Ok, one to one. Got it.
'1:1 generalization' - Don't know this. Obviously different somehow from
one to one, but how?
'1:n' - One to many, I assume.
'1:n non identifying' - Nonidentifying? What does this mean?
'n:m' - Many to many? Again, not sure.
Can anyone help clarify?
Thanks!
-Josh
Received on Thu Sep 30 2004 - 23:30:31 CEST