1. Databases MGMT 661 - Summer 2012 Night #4, Lecture Part 1 Based on textbook Chapter 6

2. Why study databases? databases are the central component of TPS, CRM, etc. Data organization impacts information quality.

3. Old Style Data Management ApplicationSoftware Data File Data File Data File ApplicationSoftware Data File Data File Many "legacy systems" still work this way.

4. textbook Figure 6-1 Terms to Know: Field / Attribute Record Field Type

5. Problems with File-based Systems Data Redundancy Data Inconsistency ◦ different values in different files ◦ different names for attributes ◦ different attributes types for the same attribute Program-data Dependence ◦ zip codes ◦ Y2K Lack of Data Sharing textbook p 211-212

6. Database Management System Database Application Application Application Application

7. The DBMS uncouples programs and data Relational Database ◦ data organized as 2D "Tables", not text Files Example DBMS ◦ Big Systems  Oracle Database  Microsoft SQL Server ◦ Small Systems  MySQL ◦ Single Computer  Microsoft Access

8. Database Design Terms to Know Table Record ◦ info about an entity (eg a supplier) Primary Key ◦ must be unique Foreign Key ◦ used to link to another table Data Dictionary ◦ what is this field ◦ read/write permissions textbook Figure 6-4

9. Database Design

10. security system sensor monitors enables/disables tests programs is programmed by security system sensor monitors enables/disables tests programs is programmed by

11. SQL - Structured Query Language Which suppliers are in Ohio? SELECT Supplier_Name from Supplier WHERE Supplier_State = "OH";

12. Web-Based Databases textbook Figure 6-16

13. Misc Database Terms Distributed Databases Data Warehouse Online Analytical Processing (OLAP) Data Mining ◦ web mining ◦ text mining Data Scrubbing

14. Homework Design the tables for a small pizza delivery shop.  Design?  number of tables?  fields in each table?  primary keys?  Uses for this information?