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I'm really sorry Bob but this is all wrong.
Citldba was really nice to you when saying "there is no right or wrong answer" but the naked truth is that there is a right and wrong answer... and this is all wrong.
1- As stated you want to build a "generic solution" ideally PHP/MySQL
2- Your notation looks like SQL Server standard
3- You are asking in an Oracle forum
4- You are "modeling" -or did you mean "prototyping" - in MS-Access
5- Your concepts of data modeling are all over the place -not necessarily good places.
I'll point just to one random issue here...
 Originally Posted by Bob Just
(While some people might try to cram this disparate data into generic fields, that would be the WRONG approach. A "Quantity" of 5 Apples is NOT the same thing as buying 5.27 Gallons of Gas!!)
...let me break the news for you, in your scenario a "quantity" of something you are buying is a "quantity" no matter what you are buying.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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