Re: many to many relationship
Date: Tue, 11 Mar 2003 15:35:01 +0000
In message <b4b321$1vdtf6$1_at_ID-114862.news.dfncis.de>, Alan
>Enrollment is not hidden in an ERD (which is a conceptual model) - it shows
>as a diamond with M:N cardinality. Can't draw it here, but in text:
That depends on your notation. When I draw up an ERD the enrolment entity would appear just like any other entity. As I said earlier, link-entities sometimes evolve into important parts of the logical model. Enrolment might have other attributes that could be important. For instance is it necessary to record the enrolment date?
-- Bernard Peek bap_at_shrdlu.com www.diversebooks.com: SF & Computing book reviews and more..... In search of cognoscentiReceived on Tue Mar 11 2003 - 16:35:01 CET