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4.1 The following data elements comprise the conceptual-level schema for a database: billing address cost credit limit customer name customer number description invoice number item

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4.1 The following data elements comprise the conceptual-level schema for a database: billing address cost credit limit customer name customer number description invoice number item number price quantity on hand quantity sold shipping address terms CHAPTER 4 RELATIONAL DATABASES 107 REQUIRED a. Identify three potential users and design a subschema for each. Justify your design by explaining why each user needs access to the subschema data elements

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