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CS 105Databases Introduction

CS 105Databases Introduction

What is a database?

What is a front-end?

What does open source mean?

How do you pronounce SQL?

CS 105 Spring 2010

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Our favorite online databases

• ESPN Major League Baseball Statistics

• Internet Movie Database

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What Is a Database?

• Database: a collection of information like a phone book or UIDirect or an address book

or• A database is a collection of objects such

as tables, queries, forms, and reports

• READ in Computer Concepts about databases!!

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What does a database look like?

• A database is a container to store data in an organized fashion

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What does a table look like?

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Tables Tables

• Data is organized into tables • The rows of a table correspond to records-- each record is an individual entry, a

row

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Tables: Datasheet View Tables: Datasheet View

Field (column) Names

• The columns of a table correspond to fields

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Sequel? Essquell? Yes, SQL

• SQL (pronounced "ess-que-el" or "seequel") stands for Structured Query Language.

• SQL is the standard language to communicate with relational database management systems.

• SQL statements are used to perform tasks such as update data in a database, or retrieve data from a database.

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Database—misusing the word

• MySQL is a database management system--DBMS

• SQLyog is a GUI—a graphical user interface or front-end for MySQL

• The word “Database” refers to the data itself, not the software than manages the data

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Where they are

• MySQL is a database management system--DBMS

SQLyog is a GUI—a graphical user interface or front-end for MySQL

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And now to appearance--GUI

• Unix is user-friendly; it's just a little particular about which users it is friendly to.

• Your Concepts Book has more about operating systems and appearance.

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What is a front-end?

A UNIX environment— not very user-friendly.

Unix view of a directory:

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Windows view of the same directory

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Editing a file in a Unix environment

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Editing the same file in FrontPage

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Thunderbird front-end for email

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What is MySQL?

• MySQL is the most popular Open Source SQL database management system, is developed and provided by MySQL AB—a “virtual” company that began in Sweden and hopes to make money from providing services.

• READ about Open Source in Computer Concepts

Licenses and copyright laws are part of our world. They are vital to both legal and illegal use of computers.

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Login

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SQLyog

To download the software, login to Compass and you can click on the icon for it.

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Standard Database ObjectsStandard Database Objects

Each of these objects must have a unique name

We can do these in SQLyog:• Table: Used to store and manipulate data.• Query: Used to retrieve information.

We can do these in other DBMS front-ends:• Form: Used to view one record of data.• Report: Used to present, calculate,

summarize, and print table data.

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Tables of student scores

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You can pull out individual student scores on a FORM (one record at at

time)

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Example of a form from the Internet

The user sees the form and not the underlying tables

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What good are forms?

Lets you view one record at a time

Customizes the display.Prevents errorHides data from viewer

Allows you to useInput Masks and guide data entry

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Input Mask, Form: Online Shopping

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A report: • An on-screen or printed display of

organized data from a table or query• May contain text, data, graphics,

borders, colors.• Examples include--depending on the

DBMS you are using-- sales summaries, invoices, mailing labels, personal address books, inventory listings

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Sample Internet Report -- UIUC

http://www.dmi.uiuc.edu/stuenr/index.htm#class

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To summarize

• What is a database?

• What is a front-end??

• How do you pronounce SQL?