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Re: Drawing arcs on ER diagrams

From: Frank van Bortel <frank.van.bortel_at_gmail.com>
Date: 18 Oct 2006 07:34:51 -0700
Message-ID: <1161182091.562496.79190@b28g2000cwb.googlegroups.com> 






Liz J schreef:



> Hi

>

> I am learning about arcs on a ER diagram.  Please could someone explain the

> significance of the circles that are on some of the arcs but not others?

>

> thanks

>

> Liz




Depends on which tool you are drawing those arcs with, and what rules
this


tool uses.



My *guess* would be: optionality: with the circle: optional, without:
mandatory.
Received on Wed Oct 18 2006 - 09:34:51 CDT












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