Essentials of Systems Analysis and Design (6th Edition)
6th Edition
ISBN: 9780133546231
Author: Joseph Valacich, Joey George
Publisher: PEARSON
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Please describe what an entity-relationship model is as well as how it operates.
Please describe what an entity-relationship model is as well as how it functions.
Describe the primary components of an entity-relationship diagram, including entities, attributes, and relationships.
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Essentials of Systems Analysis and Design (6th Edition)
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- Creation of Entity Relationship Diagram Draw the entity relationship diagram (ERD) for this information.arrow_forwardis a term used to measure the number of relationships between an entity and other entities. Multiplicity Specialty Associativity Cardinalityarrow_forwardDraw an EER diagram for the following situation using the traditional EER notation. A technology company provides offerings to its customers. Offerings are of two separate types: products and services. Offerings are identified by an offering ID and an attribute of description. In addition, products are described by product name, standard price, and date of first release; services are described by name of the company’s unit responsible for the service and conditions of service. There are repair, maintenance, and other types of services. A repair service has a cost and is the repair of some product; a maintenance service has an hourly rate. Fortunately, some products never require repair. However, there are many potential repair services for a product. A customer may purchase an offering, and the company needs to keep track of when the offering was purchased and the contact person for that offering with the customer. Unfortunately, not all offerings are purchased. Customers are…arrow_forward
- What does cardinality indicate in an entity-relationship diagram? 1:The unique identification for which data is stored 2:The maximum number of entity instances for the connection 3:The total number of primary keys for an object. 4:The total number of features of an entityarrow_forwardDescribe the purpose and operation of an entity-relationship model.arrow_forwardWhat exactly is meant to be accomplished by using an Entity-Relationship Model, and how is this model used?arrow_forward
- Analyze the given entity relationship diagram and answer the following questions. What is the degree of “has” relationship? Identify primary key(s) Identify the category of each attribute Name the cardinalitiesarrow_forwardPlease define entity-relationship modeling and describe its operation.arrow_forwardDescribe the entity-relationship model and how it works.arrow_forward
- ERD should have a minimum of 10 entities, and ideally more. Entity-Relationship Diagram The subject could be an organization that you are employed with or an organization you are observing. Contact with representative from the particular organization is encouraged but not required. using LucidChart Develop business rules You should have at least 20 business rules.arrow_forwardWhat is an entity-relationship diagram, and how does it work?arrow_forwardDescribe the process of creating an entity-relationship diagram (ERD). Provide a complex real-world scenario and design an ERD to represent it.arrow_forward
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