An entity-relationship (ER) diagram is a specialized graphic that illustrates the relationships between entities in a database. ER diagrams often use symbols to represent three different types of information. Boxes are commonly used to represent entities. Diamonds are normally used to represent relationships and ovals are used to represent attributes.
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Entity-Relationship (E-R) Diagram Problem No. 1
Create an ER diagram for the following application from the manufacturing industry: 1. Each supplier has a unique name.
2. More than one supplier can be located in the same city. 3. Each part has a unique part number.
4. Each part has a colour.
5. A supplier can supply more than one part.
6. A part can be supplied by more than one supplier.
7. A supplier can supply a fixed quantity of each part.
Entity-Relationship (E-R) Diagram Problem No. 2
The Motor Vehicle Branch administers driving tests and issues driver’s licenses. Any person who wants a driver’s license must first take a learner’s exam at any Motor Vehicle Branch in the province. If he/she fails the exam, he can take the exam again any time after a week of the failed exam date, at any branch. If he passes the exam, he is issued a license (type = learner’s) with a unique license number. The person may take his driver’s...
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