4. The following ER Diagram characterizes the miniworld of an emergency center StormEvent StormimpactType tid www....
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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 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. 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
ISBN: 978-1285085258
2nd edition
Authors: Narayan S. Umanath, Richard W. Scammel
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