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Statistical databases in theory and practice Part II: Data models

Statistical databases in theory and practice Part II: Data models. Bo Sundgren, 2011 bo.sundgren@gmail.com https://sites.google.com/site/bosundgren/ https://sites.google.com/site/bosundgren/my-life/Statisticaldatabases-anintroduction.pdf?attredirects=0.

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Statistical databases in theory and practice Part II: Data models

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  1. Statistical databases in theory and practicePart II: Data models Bo Sundgren, 2011 bo.sundgren@gmail.com https://sites.google.com/site/bosundgren/ https://sites.google.com/site/bosundgren/my-life/Statisticaldatabases-anintroduction.pdf?attredirects=0

  2. Conceptual data model and relational data model in normalised form

  3. Conceptual modelling • Define concepts and relations between them • Conceptual models and data models • Visualise models graphically

  4. Rent-A-Video: first object graph

  5. Rent-A-Video: elaborated object graph

  6. Rent-A-Video: further aspects

  7. one-to-one, symbolised by “arrow-to-arrow” one-to-many, symbolised by “arrow-to-fork” many-to-one, symbolised by “fork-to-arrow” many-to-many, symbolised by “fork-to-fork” Relations between two object types Note: The relation is usually not a flow relation! (But you should tell what kind of relation it is.)

  8. Object graphs: another example

  9. Different roles of concept modelling • Clarifying a small number of related concepts • Information model for an application • defining meaning • basis for data design • Corporate information model • for more efficient communication between people • basis for system integration

  10. Concept model ---> Data model

  11. Conceptual model ---> Star/cube model

  12. Star model for Data Warehouse

  13. Multidimensional model (cube model)

  14. Part II: Extra material Bo Sundgren 2010

  15. Concept modelling: Exercises • B2B • The customers of companies are companies • Companies have employees (persons) • B2C • The customers of companies are consumers (persons) • Companies have employees (persons) • B2B+B2C • The customers of companies are companies or consumers (persons) • Companies have employees (persons) • Hint: There are two basic object types, COMPANY and PERSON in all three examples

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