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2 Data Flow Diagrams - 副本.docx

2 Data Flow Diagrams - 副本.docx - 2 Data Flow Diagrams...

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Purchase Invoices Payments Sales Invoices Book Requests Customers (Students) 0.0 Brock University Bookstore Management System Suppliers (Publishing Companies) Employees Hours worked Cheques 2 Data Flow Diagrams 2.1 The Context Diagram 2.2 The Level Zero DFD 4
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Book data Sales Details Book data Supplier Packing Slip Payment Details Book Inventory Customer 1 Purchase Books 3 Sell Books Cash received details Cash Receipts 2 Inventory Suppliers (Publishing Companies) Customers (Students) 4 Cash Payment Cash Payment 6 Payroll Hours worked Employees Cheques Details Sales 5 Cash Receipts 2.3 The Level One DFD 5
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2.3 Books in store 2.1 Classify Books 6
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( 1, 1 ) ( 1, 1 ) ( 1, 1 ) Received ( 0, 1 ) ( 0, m ) Sold ( 1, 1 ) ( 1, 1 ) Received ( 1, 1 ) ( 0, m ) Sell ( 1, 1 ) ( 0, m ) Purchase ( 0, 1 ) ( 0, m ) Purchase Books Employee Book Purchase Invoice Sales Invoice Book Sell Books Supplier Employee Purchase d ( 0, m ) Purchase From Resource Events Agents ( 1, 1 ) ( 0, m ) Sell to Customer 3 REA/ERD of Business 3.1 REA Diagram 3.2 Other Relationships in ER model 7
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m 1 Employee Supervises Employee
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