ADM 4346 Chapter Notes - Chapter 3: Data Definition Language, Unique Key, Data Manipulation Language

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What is documentation: set of documents and models, narratives, data flow models, flowcharts, describe who, what, why, when, and where of systems, input, process, storage, output, and controls. Data flow diagrams: graphically describes the flow of data within a system, four basic elements, entity, data flow, data store, process. Entity: represents a source of data or input into the system or, represents a destination of data or output from the system. Data flows: movement of data among, entities (sources or destinations, processes, data stores. Data flow diagram levels: context, highest level (most general, purpose: show inputs and outputs into system, characteristics: one process symbol only, no data stores. Level-0: purpose: show all major activity steps of a system, characteristics: processes are labeled 1. 0, 2. 0, and so on. Ignore certain aspects of the system: determine system boundaries, develop a context dfd. Identify data flows: group data flows, number each process.

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