1. Second Normal form For tutorial

2. Second Normal Form Remove part key dependencies –Only applies to forms that are in first normal form and have a compound key i.e. more than one field in the key. –Remove the fields that are dependent on the part key and borrow the part key, to become the primary key of the new form. This form will then be a master form for the new form.

3. TNF Exercise. Objective. –To practise the normalisation technique and to produce a set of optimised relations from the normalisation of six documents. Method. –1. Apply the rules of normalisation to the supplied documents. –2. Note the business rules.

4. Supplied Documents Product Sales Report Wellingtons Invoice Product Stock Report Sales Executive report New Product / Amendment Customer Amendment

5. Business Rules Product Code is not unique – each may have a number of pack sizes. Some Customers are allowed a discount. Each item has a Standard Price and up to 3 discount prices. A customer entitled to a discount has a single discount code A, B, C and will be charged the appropriate A, B or C price for all Products he orders. At any Warehouse, a Product is only stocked in one bin. The bin code may be considered unique to a warehouse. A customer deals with one, and only one, Sales Executive.

6. Product Sales Report

7. Unnormalised Form Product Code + PackSize + ProductDescription + {InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName + InvoiceQuantity + LineValue}

8. First Normal Form ProductCode+PackSize + ProductDescription (ProductCode + PackSize)* + InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName + InvoiceQuantity + LineValue

9. First Normal form Product Sales Report The product description is dependent only on the ProductCode, so –ProductCode+PackSize + ProductDescription Becomes –ProductCode*+PackSize –ProductCode + ProductDescription

10. 2nf Product Sales Report and –(ProductCode + PackSize)* + InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName + InvoiceQuantity + LineValue becomes –(ProductCode + PackSize)* + InvoiceNumber* + InvoiceQuantity + LineValue And –InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName

11. 2 nd Normal form Product Sales Report

12. Invoice

13. Unnormalised Form InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName + CustomerInvoiceAddr + {ProductDescription + ProductCode + PackSize + StandardPrice + DiscountCode + DiscountPrice + InvoiceQuantity + LineValue} + InvoiceValue

14. First Normal Form InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName + CustomerInvoiceAddr + DiscountCode InvoiceNumber* + ProductCode + PackSize + ProductDescription + StandardPrice + DiscountPrice + InvoiceQuantity

15. Second Normal Form InvoiceNumber + InvoiceDate + CustomerNumber + CustomerName + CustomerInvoiceAddr + DiscountCode InvoiceNumber* + ProductCode + PackSize + DiscountPrice + InvoiceQuantity ProductCode + ProductDescription ProductCode + PackSize + StandardPrice

16. Product Stock Report

17. Unnormalised Form ProductCode + PackSize + Warehouse + StockQuantity + BinCode + NoOrdYTD + StockQuantityTotal + NoOrdYTDTotal

18. First Normal Form ProductCode + PackSize + StockQuantityTotal + NoOrdYTDTotal (ProductCode + PackSize)* + Warehouse + StockQuantity + BinCode + NoOrdYTD

19. 2 nd Normal Form ProductCode + PackSize (ProductCode + PackSize)* + Warehouse + StockQuantity + BinCode + NoOrdYTD –remains the same

20. Sales Executive Report

21. Unnormalised Form SalesExecutive + CustomerNumber + OrdersYTD + ValueOrders + DiscountCode + OrdersYTDTotal + ValueOrdersTotal

22. First Normal Form SalesExecutive + OrdersYTDTotal + ValueOrdersTotal CustomerNumber + SalesExecutive* + OrdersYTD + ValueOrders + DiscountCode No compound keys, so no change for 2NF.

23. New Product / Amendment

24. Unnormalised Form ProductCode + PackSize + ProductDescription + PrescriptionIndicator + UnitQuantity + UKDrugRegNo + MinimumStock + DiscountCode + DiscountPrice

25. First Normal Form ProductCode + PackSize + ProductDescription + PrescriptionIndicator + UnitQuantity + UKDrugRegNo + MinimumStock ProductCode + PackSize + DiscountCode + DiscountPrice Product Description, Prescription Indicator and UKDrugRegNo only depends on Product Code

26. Second Normal Form ProductCode* + PackSize + UnitQuantity + MinimumStock ProductCode + ProductDescription + UKDrugRegNo + PrescriptionIndicator ProductCode + PackSize + DiscountCode + DiscountPrice

27. Customer Amendment

28. Unnormalised Form CustomerNumber + SalesExecutive + PreferredCustomer + CustomerName + CustomerInvoiceAddr + CreditLimit + BulkPackOnly + DiscountCode + LicensedDrugVendor + CustomerDeliveryAddress