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In addition, provide an explanation for each business rule in the following format: A relationship between customer and purchase ( see above ) is 1
In addition, provide an explanation for each business rule in the following format:
"A relationship between customer and purchase see above is :M as every customer may have many purchases and each purchase belongs to only one customer. The relationship is optional on the many side because business rules say that every customer may have a purchase. It is mandatory on the one side because business rules say that every purchase must belong to a customer. According to business rules, the cardinality on the many sides is N because it is optional and for the one side because it is mandatory. A weak relationship will be used as purchases are not dependent on customers.
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