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Announcements

Announcements. No class on Thursday Time to get together with your group and work on the project Office Hours this week: Today: 1:00 to 1:30 Wednesday: 10:00 to 11:00 Friday: 1:30 to 2:30. Practice Exercise Normalize Payment Voucher. Payment Voucher. Payment Voucher. First Normal Form

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Announcements

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  1. Announcements • No class on Thursday • Time to get together with your group and work on the project • Office Hours this week: • Today: 1:00 to 1:30 • Wednesday: 10:00 to 11:00 • Friday: 1:30 to 2:30

  2. Practice ExerciseNormalize Payment Voucher Payment Voucher

  3. Payment Voucher • First Normal Form • Select and define data elements of interest • Eliminate repeating groups • Identify primary key • Business Process Assumptions

  4. Primary Key? • One from non-repeating section • PV-Num • One from each repeating section • ProdCode • RRNum

  5. Second Normal Form • Is the FNF table in Second Normal Form? • Why or why not? • If not, what are the functional dependencies? • What business process assumptions did you make?

  6. Second Normal Form • Required since concatenated primary key • Seven combinations • PVNum ProdCode RRNum • PVNum + ProdCode • PVNum + RRNum • RRNum + ProdCode • PVNum + ProdCode + RRNum

  7. Functional Dependencies

  8. Corresponding Documents Table • Is this table in second normal form?

  9. Third Normal Form • Are the SNF tables in Third Normal Form? • Why or why not? • If not, what are the transitive dependencies? • What business process assumptions did you make?

  10. SNF Tables

  11. Third Normal Form • Transitive dependencies? • Supplier Information • PVNum identifies Supplier Name • Supplier Name identifies Supplier Shipping Address, CSZ?

  12. PV Normalized Schema

  13. Common Tables? • ZipCityState (all 3) • Product (all 3) • Supplier Shipping Location (PO & RR) • Supplier Sales Office (PO & PV) • Receiving Report Detail (RR & PV)

  14. Database Schema for Purchasing Cycle • These are the tables and relationships used to generate the Purchase Order, Receiving Report, and Payment Voucher

  15. Assignment • Design Third Normal Form Datadase for Order Fulfillment of CRC • You must be able to create these reports from data within the tables. • Sales Order Confirmation • Bill of Lading • Backorder Notice • Focus on the data, not the process • Do not worry about what triggers the Backorder Notice, just be able to create the report from the underlying tables

  16. Assignment • Once you have designed the tables: • Use Access to document the relationships between the tables and as your data dictionary • Create empty tables in Access • Enter the abbreviated field names, specify the data type and size, enter the long name as the caption • Set the primary key fields

  17. Assignment • Use the “relationships” feature in Access to define the relationships between tables • Always set to enforce referential integrity

  18. Assignment • Provide a description of the processes that you used to design the third normal form tables. Specifically: • You must justify your selection of fields for the primary keys • You must describe how you know that each table is in third normal form. • Provide all assumptions you had to make regarding the nature of the business operations to support the placement of the various data elements within the tables.

  19. Review • What is normalization and why is it important to normalize a database? • Distinguish between First, Second and Third normal forms. • What are the characteristics of a “primary key”?  • What does it mean when there is a “one to many” relationship? • What is a "foreign key"?

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