© 2004 Ken Baldauf, All rights reserved. Database Systems Organizing Data in a Database Using Database Systems in Organizations Emerging Database Trends.

© 2004 Ken Baldauf, All rights reserved.

Database Systems

Organizing Data in a Database Using Database Systems in

Organizations Emerging Database Trends

Please turn your cell phone off.


The Value of Databases

Databases and Database Management Systems (DBMS) transform large quantities of data into specific and valuable information for accomplishing some goal.


Organizing Data in a Database


File or Table

Database

A collection of data organized to meet user’s needs.

Records (Entities)

Field(Attribute)


Database Fields

Fields are set to hold specific types of data.


Database

A Database is a

collection of files/tables


Database Heirarchy


Keys and Primary Key

Key: A field in a record that is used to identify the record

Primary key: A field that uniquely identifies a record A primary key field prevents duplicate

records from occurring in a table.


Primary Keys

Which field would act as the best primary key?Which field would act as the best primary key?


Primary Keys


Relational Database

In a relational database, tables are linked (related) through common fields.


Relation Types One-to-many

Most typical Makes use of primary key

One-to-one Many-to-many


Northwind Database Example

http://lit.cs.fsu.edu/recitation-notes/nwind.mdb


In-class Exercise

Database Specification: Build a database to store student grades for Mr. Baldauf’s students There are multiple classes with multiple

sections each with a unique Course Reference Number (CRN)

The courses are divided between multiple recitation instructors identified by SSN

Students identified by SSN


In-class Exercise

The database should be able to provide the following reports:


Database Management Systems


Database Management System (DBMS)

A DBMS consists of a group of programs that manipulate the database and provide an interface between the database and the user.

Front End

DATABASE

Back End

DBMS

SecureAccess


Gradebook Example

FrontEnd

BackEnd


Gradebook Example

FrontEnd

BackEnd


Database Strengths

Data can be sifted, sorted, queried through the use of data manipulation languages.

The power of a database and DBMS lies in the user’s ability to manipulate the data to turn up useful information.


Data Manipulation Language

A Data Manipulation Language (DML) is a specific language provided with the DBMS that allows people and other database users to access, modify, and make queries about data contained in the database, and to generate reports.

Structured Query Language (SQL): The most popular DML. SELECT * FROM EMPLOYEE WHERE JOB_CLASSIFICATION = ‘C2”


Using Databases in Organizations


Data Stores

Data Warehouse: A database that holds important information from a variety of sources.

Data Mart: A small data warehouse, often developed for a specific person or purpose.

Data Mining: the process of extracting information from a data warehouse. “Connecting the dots”


Emerging Database Trends


Distributed Database


Databases and the Internet

The Web is frequently used as the Front End of DBMS’s.


Media Databases

Databases are increasingly being used to store visual and audio data.

Consider the digital hospital and how it might handle patient records including x-rays.


Questions?

Don’t forget to turn your phone back on!!

© 2004 Ken Baldauf, All rights reserved. Database Systems Organizing Data in a Database Using Database Systems in Organizations Emerging Database Trends.

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