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<div class="content wysiwyg-content">
Hi Expert,<br />
<br />
I read Entity-relationship_model in this website<br />
<br />
<a href="http://en.wikipedia.org/wiki/Entity-relationship_model" rel="ugc">http://en.wikipedia.org/wiki/Entity-relationship_model</a><br />
<br />
I have several question<br />
<br />
1. why Character entity &nbsp;have double lines surrounding this Entity?<br />
2. what dotted line under CharName means?<br />
3. why playersln in Region entity &nbsp;is dotted line? <br />
<br />
thanks in advance.<br />
<br />

</div>
</div>


Hi Expert,

I read Entity-relationship_model in this website

http://en.wikipedia.org/wiki/Entity-relationship_model

I have several question

1. why Character entity  have double lines surrounding this Entity?
2. what dotted line under CharName means?
3. why playersln in Region entity  is dotted line? 

thanks in advance.



Entity relationship diagram notation

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