1. Computer Concepts 5th Edition Parsons/Oja Page 492 CHAPTER 10 File And Database Concepts Section A PARSONS/OJA Databases

2. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Data integrity  Data is one of the company’s most valuable assets British Airways  Integrity: how accurate is the data? GIGO

3. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Characteristics of valuable information  Reliable Accurate  Relevant To decision maker  Timely Before decision is made

4. Computer Concepts 5th Edition Parsons/Oja Page 494 Section A Chapter 10 File and Database Concepts Databases: What is a database?  A database is a collection of information  A field contains the smallest unit of meaningful information, so you might call it the basic building block for a structured database  Each field has a unique field name that describes its contents  A field can be either variable length or fixed length.

5. Computer Concepts 5th Edition Parsons/Oja Page 495 Section A Chapter 10 File and Database Concepts Records: What is a record?  A record refers to a collection of data fields

6. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Updating data  Adding records Each record must have a unique primary key  Changing records Correct or update data  Deleting records What if they are the building blocks for an object you have created?  Validating Checks data entry  Social security number can’t be 45

7. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Validating data (Field validation rules)  Alpha/numeric Name can’t be 35 and phone number can’t be CUBS-LOSE  Range check Age can’t be 149  Consistency Date terminated can’t be before date hired  Completeness Can’t have 345-555 for a phone number  Select from drop down list State

8. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  File processing  Each department maintains its own data Data redundancy Isolated data  Database  Users share the same data Reduces redundancy  Integrity and extra storage

9. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Querys  Allows users to retrieve desired data  Query be example CO Or: meet either criteria And: must meet both criteria The NOT operator  <>  Forms  Provides data entry screen to update database  Reports  Design a report for printing or to view

10. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Security  Allows only authorized users  Different levels of access privileges  Identity theft  Privacy  Social security numbers

11. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Relational database  Stores data in tables Table should only include one subject  Employees  Students  Grades  Housing  Payroll Primary key: must be unique and not blank  Stores relationships Must have common field  Can’t create queries using fields from two tables if no relationship  Sorting

12. Computer Concepts 5th Edition Parsons/Oja Page 493 Chapter 10 Databases  Database design  Determine what data must be collected and stored  Don’t collect data that can be calculated Date of birth versus age  Organize that data into fields  Name versus  Last Name and First Name  Determine relationships between tables