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4. The following ER Diagram characterizes the miniworld of an emergency center StormEvent StormimpactType tid www. sid date 0..* 0..* typeName comments [0..*] /noEvents
4. The following ER Diagram characterizes the miniworld of an emergency center StormEvent StormimpactType tid www. sid date 0..* 0..* typeName comments [0..*] /noEvents This Year 1..1 0..* StormCenter lid lat 0..* long time damage County cid 1..1 cName sheriffs Office street no city zip a) State which attributes are simple, composite, multi-valued, and derived. b) State the cardinality ratios and participation constraints of each relationship and describe what it implies. c) Draw a relational schema for this miniworld. Include all primary keys and all foreign keys.
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Data Modeling and Database Design
Authors: Narayan S. Umanath, Richard W. Scammel
2nd edition
1285085256, 978-1285085258
