There are two kinds of data flow diagrams: logical and physical. Why does a data warehouse need meta data so much?
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There are two kinds of data flow diagrams: logical and physical. Why does a data warehouse need meta data so much?
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- Using a graphics program, develop an entity-relationship diagram for a database application for an Internet bookstore where students buy textbooks from a salesperson and receive invoices for their purchases. Use Figure 5.5 as a guide.Data flow diagrams may be classified as either "logical" or "physical." A data warehouse cannot function without MetaData.When comparing logical data flow diagrams with physical data flow diagrams, what is the difference between them?