SMG IS 465 Lecture Notes - Lecture 3: Database
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20 Mar 2022
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Document Summary
Statements about data that define or constrain some aspects of the business. Precise but expressed in terms familiar to end users. Customers purchase gardening items from the housedepot store. Customers may or may not have placed orders. Each order is assigned a unique order code and order may have multiple items. Relevant customer information includes name, address, and telephone number. Declarative: what the relationship between data are. Class of object with many instances in the db. Class of object composed of multiple attributes. Class of object that we are collecting data for. An output of the db system (eg: a report) Exists independently of other types of entities. Property or characteristic of an entity or relationship.