Databases

Topic 4

Text MaterialsChapter 3 – Databases and Data Warehouses

Concepts

•Data should be:- Available- Up-to-date/current- Error free- Accessible- Useful- Secure- Well organized- Not redundant

Types of data, Traditional- Customer- Billing- Assets- Liabilities- Payroll- Sales- Payables due- Inventory- Customer payment history

Types of data, Multimedia- Pictures of products- Training videos- Web pages- Product views and instructions

Data

Convenience Stores

Benefits

Departmental Database Use

• Finance and Accounting

• Human Resources

• Manufacturing, Production, Operations

• Marketing and Sales

Before Databases

Issues inefficient, costly, inaccurate, slow, inflexible.

?

A Database is . . .

A collection of related files containing records on people, places, or things.

• DBMS - Software that gives the ability to create, manipulate, and access data.

- Used to process transactions and store business information.

• RDBMS – Relational, data is contained in Tables that are easily related to each other. Today most popular type of DBMS. Our focus.

• Oracle, IBM DB2, SQL, Access

Some Database Terminology

Table – A grouping of rows and columns that contain data about something.

The rows are called records which are information about a single item in a table.

The columns are called fields which are a single characteristic of a record.

Common fields are used to connect records that are in separate tables.

Concepts

DatabaseOperatingSystem

RDBMS

A Table, Records, and Fields

Database Basic Functions

• Create, Maintain, and Update Data (such as employees, transactions, or products)

• Interrogate (called a Query)

• Generate Reports

• Build applications

An Access Table

An Access Form

An Access Report

Types of Table Relationships in a RDBMS

• One-to-Many (1:n) One record in the first table matches many records in the second table, and one record in the second table matches back to exactly one record in the first table.

• One-to-One (1:1)One record in the first table matches one record in the second table, and one record in the second table matches back to exactly one record in the first table.

• Many-to-Many (n:n)One record in the first table matches many records in the second table, and one record in the second table matches back to many records in the first table.

Examples:

Students and ProfessorsDepartments and ProfessorsAuthors and BooksStudents and CarsEmployees and DesksCustomers and Orders

Object-Oriented Databases

Data Warehouses

Data Warehouses

Challenges in Data Resource Management

• Vast amounts of data

• Secure

• Available

• Back up / Archive

• Easy to use

• Handle growth

• Specialists

Trips Relational Database – A simple example

Trips Relational Database – A simple example

Trips Relational Database – A simple example

Trips Relational Database – A simple example

Database Query Results

Class Exercise

Go to the instructor website www.uta.edu/faculty/weltman and download the rafting trip database.

Use the database and QBE (query by example) tool to show all our Colorado trips.

Print out and turn in your query results.

Class Exercise

Class Exercise

Class Exercise

Online Analytical Processing - OLAP