1. BA471 Management Information Systems Databases - continued

2. Database Fundamentals  Data modeling – next steps Create an ERD  Logical design  Relational Data definitions  Business definitions  Metadata  Domain

3. Database Fundamentals  Physical data design Forward engineer a physical database DDL – Data Definition Language  Creates Schema Role of the Database Administrator (DBA)

4. Database Fundamentals  Data normalization: Physical implementation of data in its logical groupings  De-normalized data example: Ord # Ord Date Cust # Cust Name Cust Addr Prod # Prod nameQty Prod Price Prod Total Order Status Order Total

5. Database Fundamentals  Normalized example: ORDER ORDER-PRODUCT First Normal Form (1NF) Ord # Ord DateCust # Cust NameCust Addr Order StatusOrder Total Ord #Prod # Prod nameQtyProd Price Prod Total

6. Database Fundamentals  Normalized example (3NF): ORDER Ord #Ord DateCust #Order Total CUSTOMER Cust #Cust NameCust Addr ORDER-PRODUCT Ord #Prod #QtyProd Total PRODUCT Prod #Prod NameProd Price

7. Database Fundamentals  Enterprise Data Warehouse ERP Product Data EDW Summarized Product Data extract Reports Online Inquiry Finance Sys Product Revenue Data extract

8. Database Fundamentals  Data Quality issues Ways in which data quality can be compromised  Errors at data entry  Software-introduced errors  Deterioration over time  Sabotage  Honest mistakes