Explain the difference between is-a and has-a relationships

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Reference no: EM131219027

a. Explain the difference between exclusive subtypes and inclusive subtypes. Give an example of each.

b. What is a discriminator?

c. Explain the difference between IS-A and HAS-A relationships.

d. What is the most important reason for using subtypes in a data model?

e. Describe the relationship between the structure of forms and reports and the data model.

Reference no: EM131219027

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