Ternary Relationship cardinality - comp.databases.theory

Message from discussion Ternary Relationship cardinality

mikl...@gmail.com

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More options Sep 19 2006, 8:57 am

Newsgroups: comp.databases.theory

From: mikl...@gmail.com

Date: 18 Sep 2006 23:57:19 -0700

Local: Tues, Sep 19 2006 8:57 am

Subject: Re: Ternary Relationship cardinality

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sorry I meant recursive relationship .. eg. Person Marries Person

J M Davitt wrote:
> mikl...@gmail.com wrote:
> > Hi,

> > I am working on an assignment which has 2 ternary relationship. I'm
> > can't figure out their cardinality.

> > Maybe I am going through one of those mental blocks...

> > Can someone give me some cardinality examples for N-ary relationships?
> > all the pics i found on google images don't include this..

> > My other option is to convert the 3-ary relationship into a weak
> > entity.. but I'll definitely loose marks on that

> > Is it ok to have N'ary Relationships which includes recursion? looks
> > kind of odd to me
> > eg [person](buyer) trades [item] with [person](seller)

> Recursion? How so?

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