Computer Science 1032A/B Final: Computer Science Final.docx

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COMPSCI 1032A/B Full Course Notes
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COMPSCI 1032A/B Full Course Notes
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Document Summary

Keeping track of more than one theme. Design reflects the organization that exists within the data. Captures organization of the data logical representation of the data. Model: representation of reality that retains only selected details. Powerful tool for validating necessary details and eliminating irrelevant details. Associate or map, elements in reality to elements in the model. First make an entity relationship model (e-r diagram) Graphical method of mapping the real world. Once the e-r model is built, it is used as a blueprint for the real database. Model is mapped to an actual relational database. E-r model: most popular for data modeling, diagrams used to document a model and describe structured data introduced in 1976 by peter chen many variants. Student attributes student number, name, address, phone number, date of birth. An instance of the entity is a set of data items that exist. Necessary to uniquely identify the instance of each entity.

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