Database Design

I know WHAT these concepts are; I understand their definitions:  strong/weak entity, strong/weak relationship, participant optionality.  I do not understand WHY they are important to database design.  Why do I care if an entity is strong or weak?  Why do I care if a relationship is strong or weak?  Why do I care if participant optionality is optional or mandatory?
PeterAsked:
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amilie wilsonCommented:
It matters a lot what you pick in designing the database like weak entity is the one who always depends on the strong entity like there is a child who always depend on the parent but parent doesn't. Similarly when you design any database you have to take ideal case so it can be handle any kind of query.  It should no be depend on any case. I hope you understand with this.

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PeterAuthor Commented:
So, in your example, during the design of the database, the reason I must understand that the weak entity is the child and the strong entity is the parent is because ... that informs me of how to depict the relationship properly in the ERD so that the eventual database "can handle any kind of query"?

What do you mean by "It should no be depend on any case"?
David AndersTechnician Commented:
I found this useful, it is written for Filemaker Novices.
White Paper for FMP Novices
http://www.foundationdbs.com/Downloads/WhitePaperForFMPNovices.pdf
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