1. Design and Create Tables to Store Data Chapter 2
Intro to MIS - MGS351
Design and Create Tables to Store Data Chapter 2

2. Databases and Decision Making Designing Database Tables
Chapter Overview
Databases and Decision Making
Designing Database Tables
Creating Tables in Access
Primary Keys
Field Data Types and Properties

3. GIGO – Garbage In, Garbage Out
Databases and Decision Making
Input
(Data)
Process
Output
(Information)
Input using Forms Handled by Queries Output to Reports
Stored in Tables Supports Decision Making
GIGO – Garbage In, Garbage Out

4. Your tables are the foundation of the entire database.
Designing Database Tables
Database design is critically important to the success of an information system.
Your tables are the foundation of the entire database.

5. Designing Database Tables
Include the necessary data
Determined by reporting needs
Store data in its smallest parts
Split last and first names
Avoid storing calculated data (GPA)
What about age versus birthdate?
Avoid data redundancy

6. Creating Tables in Access
Table Wizard (don’t use)
Datasheet and Design Views

7. Primary Keys
A field or combination of fields that uniquely identifies records in a table.
Use an existing field
Use a combination of fields (concatenated key)
Create a new field using the Autonumber data type

8. AutoNumber Currency Short Text Yes / No Hyperlink OLE Object Number
Field Data Types
AutoNumber
Short Text
Hyperlink
Number
Long Text
Date / Time
Currency
Yes / No
OLE Object
Attachment
Calculated
Lookup Wizard

9. These help to prevent GIGO
Field Properties
Field Size
Format
Input Mask
Caption
Default Value
Validation Rule
Validation Text
Required
Allow 0 Length
Indexed
These help to prevent GIGO

10. Questions & Requested Updates from HR Users
Bad data appears in AssessmentScore
Need address of every applicant
Want option to store 9 digit zip code
CID value occasionally skips numbers
Need to track the HR employee assigned to each candidate
Data entry and editing is not user-friendly

11. What does GIGO stand for? a. Gee, I Goofed, OK
Quick Review
What does GIGO stand for?
a. Gee, I Goofed, OK
b. Grand Illusions, Go On
c. Global Indexing, Global Order
d. Garbage In, Garbage Out

12. Which of the following is true of the primary key?
Quick Review
Which of the following is true of the primary key?
a. Its values must be unique
b. It must be defined as a text field
c. It must be first in a table
d. It can never be changed

13. Which fields are commonly defined with an input mask?
Quick Review
Which fields are commonly defined with an input mask?
a. Social Security number
b. First, middle and last name
c. City, state and zip code
d. All of the above

14. Which field data type appears as a check box in a table? a. Text field
Quick Review
Which field data type appears as a check box in a table?
a. Text field
b. Number field
c. Yes/No field
d. All of the above

15. Quick Review
The______ is a field, or combination of fields, that uniquely identifies a record.