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Database Design 1

Database Design 1. CMS 476 Fall 1, 2007 Dr. Karl Horak, Instructor. Session 5. Week in Review Application du Jour Lecture: Normalization Demonstration: Modeling, cont. Exercises. Week in Review. Cross-site scripting vulnerability Visiting scholar returns home Oh, yes, and grading.

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Database Design 1

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  1. Database Design 1 CMS 476 Fall 1, 2007 Dr. Karl Horak, Instructor

  2. Session 5 • Week in Review • Application du Jour • Lecture: Normalization • Demonstration: Modeling, cont. • Exercises

  3. Week in Review • Cross-site scripting vulnerability • Visiting scholar returns home • Oh, yes, and grading

  4. Tonight’s Lecture Topic:Normalization • Method 1 • Method 2

  5. The Daisy Hill Puppy Farm

  6. Method 1—The Old Way • Eliminate Repeating Groups • Eliminate Redundant Data • Remove Items Not Dependent On Key

  7. Eliminate Repeating Groups Make a separate table for each set of related attributes, and give each table a primary key. How?Split the table into two tables: Puppy Table = Puppy Number+ Puppy Name+ Kennel Code+ Kennel Name+ Kennel LocationTrick Table = Puppy Number + Trick ID+ Trick Name+ Trick Where Learned+ Skill Level

  8. Eliminate Redundant Data If an attribute depends on only part of a multi-valued key, remove it into a separate table. How?Split the Trick Table into two: Tricks and Puppy Tricks. Tricks = Trick ID+ Trick NamePuppy Tricks = Puppy Number + Trick ID+ Trick Where Learned+ Skill LevelPuppy Table = Puppy Number+ Puppy Name+ Kennel Code+ Kennel Name+ Kennel Location

  9. Tricks = Trick ID+ Trick NamePuppy Tricks = Puppy Number + Trick ID+ Trick Where Learned+ Skill Level Puppies = Puppy Number+ Puppy Name+ Kennel Code Kennels = Kennel Code+ Kennel Name+ Kennel Location Remove Items Not Dependent On Key If attributes do not contribute to a description of the key, remove them to a separate table. How?Split Puppy Table into two tables: Puppies and Kennels

  10. Result PuppyTricks Tricks Puppies Kennels

  11. Method 2—New and Improved • Create Object-Role Model • Generate Entity-Relationship Diagram • Build database tables

  12. Object-Role Model

  13. Generate ER Diagram

  14. Your Choice • Method 1—Largely by inspection and following arcane rules. • Very difficult in complex situations • Easy to screw up • Method 2—Model the objects and their roles, then let the machine do it. • Requires additional software proficiency • Easy

  15. Some More VM Tips • File | Preferences to change “freeform” to “guided” for default Fact Editor screen • Under Application tab, set to save before build • Look at the documentation—excellent PDFs with real-world samples and explanations

  16. Demonstration • Back to VisioModeler • The Daisy Hill Puppy Farm Example http://70.56.215.209/khorak/CSF/SQLexercises.mdb

  17. Exercises and Q&A • Approaching a solution for HW #2 • Scoping the problem • Core objects and verbs

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