ENTITY RELATIONSHIP DIAGRAM Shown here is a partial entity relationship diagram of a purchase system. Describe the business rules represented by the cardinalities in the diagram. PROBLEM 4: ENTITY RELATIONSHIP DIAGRAM Updates Contains Inventory M 1 M 1 Supplier 1 1 M Receiving Report M Is Associated with 1 1 M Purchase Order
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The ERD includes the following entities: Updates, Contains, Inventory, Supplier, Receiving Report, Is Associated with, and Purchase Order. It also includes relationships among these entities. Show more…
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FIGURE 2.4: A COMPARISON OF THE OO, UML, AND ER MODELS Object Representation UML Class Diagram ER Model INVOICE CUSTOMER generates +belongs to CUSTOMER generates INVOICE INVOICE INV_DATE INV_NUMBER INV_SHIP_DATE INV_TOTAL INV_NUMBER: Integer INV_DATE: Date INV_SHIP_DATE: Date INV_TOTAL: Double IN_NUMBER INV_DATE INV_SHIP_DATE IN_TOTAL 1.1 0.1 1.1 CUSTOMER +belongs to LINE LINE LINE
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Akash M.
Describe an intersection operation on a relational database. Illustrate how your operator works by answering the following query, using the relations of Tables $3.6 .4-3.6 .7:$ Find the names of all buyers who buy both parts $2 \mathrm{~A}$ and $1199 \mathrm{C}$. Also, write a sequence of operations that could be used to answer the query.
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