In message <b4b321$1vdtf6$1_at_ID-114862.news.dfncis.de>, Alan
<alan_at_erols.com> writes
>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 cognoscenti
Received on Tue Mar 11 2003 - 09:35:01 CST
