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Summary Database notes

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This document gives out a hint of how the database environment looks like and how it is being made. If you need any Codes to make website consider it advantageous after going through this article

Institution
Kenyatta University
Course
Health records

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Database Environment

, Three-Level ANSI-SPARC Architecture
• External level
– User's view
– Data gathering
• Conceptual level
– Organization view (entity, attribute, & relationship)
– Constraints and security
– Entity-relationship diagram
– Normalization
• Internal level
– Physical presentation
– Storage, index, compression, & encryption
– File organization

, Database Schemas
• Database schema (intension) & database
instance (extension)
– External schemas (subschema)
– Conceptual schema (database schema)
– Internal schema
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Kenyatta university
Course
Health records
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Number of pages
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