B ITM 330 Lecture Notes - Lecture 7: Systems Development Life Cycle, Cardinality
19 Nov 2017
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Document Summary
Chapter four: the three stages of database development are: Three stages of database development: requirements analysis stage, component design stage. Implementation stage: these three stages are part of the five stage systems development life. The requirements analysis stage: user interviews, forms, reports, queries, use cases, business rules, after the requirements have been gathered, they are transformed into an. Entity relationship (e-r) data model: the most important elements of e-r models are, entities, attributes. Identifiers: relationships, an entity class is a description of the structure and format of the occurrences. Entity class versus entity instance of the entity: an entity instance is a specific occurrence of an entity within an entity class, entities have attributes that describe the entity"s characteristics: Attributes: projectname, startdate, projecttype, projectdescription, attributes have a data type and properties, entity instances have identifiers, an identifier will identify a particular instance in the entity class:
