Option #1: the ODL Approach

4 tables: each object can only belong to a single class

Product(name, price, category, manufacturer)

EducationalProduct( name, price, category, manufacturer, ageGroup,

topic)

SoftwareProduct( name, price, category, manufacturer, platforms,

requiredMemory)

EducationalSoftwareProduct( name, price, category, manufacturer,

ageGroup, topic, platforms,

requiredMemory)

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