Ess of Sys Anls- Rvw Sol- Ch 06

Ess of Sys Anls- Rvw Sol- Ch 06 - Chapter 6: Review...

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Chapter 6: Review Questions Solutions 1. What characteristics of data are represented in an E-R diagram? An E-R diagram shows many characteristics of data, including the definition, structure, and relationships within data. Additionally, this diagram shows cardinalities, relationship degrees, and business rules. 2. What elements of a data flow diagram should be analyzed as part of data modeling? Data stores, data flows, and even processes all provide information for data modeling. A data store often represents one or more data entities and their associated attributes. All data in data flows must either be stored in some entity, be computed from data in entities, or in rare circumstances pass through the system. The description of a process can shed light on business rules that must be represented in the data model. 3. Explain why a ternary relationship is not the same as three binary relationships. A ternary relationship represents the simultaneous association of three entities (such as a selling relationship links a customer with a product and salesperson), not three binary relationships (between a sale entity/associative entity and customer, sale and product, and sale and salesperson). 4.
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Ess of Sys Anls- Rvw Sol- Ch 06 - Chapter 6: Review...

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