Intro to Access and Data Management

Announcements

• No Class – Monday

• Chapter 5 – Wednesday

• Access Tutorial & DB Creation - Friday

The Database Approach

Database management system (DBMS)

Minimize the following problems:

Maximize the following:

1. Data redundancy2. Data isolation3. Data inconsistency

1. Data security2. Data integrity3. Data independence

How is data organized in a DB:Data Hierarchy

Field

Record

File (or table)

Database

Is a grouping of

Is a grouping of

Is a grouping of

Data Hierarchy (continued)

Field

RecordDatabase

Table

Database Management Systems

Database management system (DBMS)

Focus of this course: Relational database model Related Tables (Primary Keys Important) Data dictionary

How do you request data? Structured Query Language (SQL) - keywords

Query by Example (QBE) – forms/templates

Relational DB Effectiveness: Normalization

Normalization (most streamlined DB)

Minimum redundancy

Maximum data integrity

Best processing performance

Normalized data occurs when attributes in the table depend only on the primary key.

Exercise #1 – Online Shopping DB

Create a new DB called OnlineShopping that will consist of three tables.

CustomersOrdersProducts

Exercise #1 – Online Shopping DB

Customers Data_Type Field Size

CustomerID Text 5FirstName Text 50LastName Text 100Address Text 150City Text 30State Text 2PostalCode Text Input Mask PhoneNum Text Input Mask

Products Data_Type Field Size

ProductID Text 5ProductName Text 50Category Text 50Cost ?  

Orders Data_Type

Field Size

OrderNo ?  CustomerID ? ?ProductID ? ?OrderDate ?  

Exercise #1 – Online Shopping DB

Create the appropriate relationships for the tables in your database.

Customers -> OrderProducts -> Order

Exercise #1 – Online Shopping DB

Enter information into tables.

CustomersCustomerID FirstName LastName Address CIty State PostalCode PhoneNumber

1111 Michael Jordan 123 Anywhere Rd Wilmington NC 28401 (910) 555-5555

2222 Larry Bird 456 Somewhere St French Lick IN 47432 (812) 555-5555

3333 Irvin Johnson 789 Nowhere Ave Los Angeles CA 90001 (213) 555-5555

ProductsProductID ProductName Category Cost

00001 Basketball Sporting Goods $25.00

00002 Shorts Apparel $20.00

00003 Shoes Apparel $75.00

Orders

OrderNo CustomerID ProductID OrderDate

1 1111 00002 9 /18/2012

2 2222 00001 9 /18/2012

3 3333 00003 9 /18/2012

4 1111 00001 9 /20/2012

autonumber

Exercise #1 – Online Shopping DB

Create a query to answer the following question:

What is the total amount spent on all orders by each customer?