Introduction to Database Systems Computer Science & Engineering Introduction to Database Systems This lecture will cover the use of some basic functions provided by EXCEL. We will be explore how these functions work and how they can be used to solve problems.

Database Terms Data Information A collection of numbers and text 273459368 Information Meaning derived from the data SSN: 273-45-9368

What is a database? Examples of computer databases A large collection of data stored in a well-defined structure You can think of a database as An electronic filing system A repository for large amounts of information Example of a paper database Telephone book Examples of computer databases Ohio State stores student information in a database Insurance companies store policy holder information in a database Your employer stores your information in a database

Database Software How do I create a database? Purchase the software We will use MS Access 2010, but there are many database software products Oracle Sybase SQL Server How do I access information in the database? Purchase a Database Management System (DBMS) A DBMS is a collection of programs that enable you to enter, organize, and select data in a database. We will use MS Access 2013, but there are many database management software products

Steps when setting up a Database The design should be initially created schematically, and then the database should be created using the chosen database software

1. Decide what information you will store in the database Research Papers database First Name Charge Amount Last Name Charge Date Address Payment Amount City Payment Type State Payment Date Zip Code   Home Phone This database is a very simplistic one. Most databases you create will be much more complex.

2. Create the layout of the database What tables do you need in your database? What is a table? An entity used to organize information by categories of like information

Research Papers Database Tables Client Stores client information Charges Stores client charges information Payments Stores client payment information PaymentMethod Stores the payment method Credit Card Cash Check

2. Create the layout of the database What fields do you need in your database? What is a field? An attribute (piece of information) of the table/entity. How will you set them up? Divide Tables into Inseparable Fields Address as 1 field – 17 Main St. New York, New York 10002 Address as 4 fields Street Address - 17 Main St. City - New York State - New York Zip code – 10002

Research Papers Database Table Name: Client Fields: Client ID   First Name Last Name Address City State Zip Code Home Phone Charges Charge Amount Charge Date Payments Payment Amount Payment Type Payment Date PaymentMethod MethodID MethodType

2. Create the layout of the database Fields contain field types/data types and field properties What is a field Type/Data Type? Defines the type of information that can be stored. i.e. text, numbers, dates, etc. What is a field Property? Field size Input Mask Validity Default Value

Research Papers Database Table Name: Client Field Type/ Data Type Properties   Fields: Client ID Text 5 Characters long Primary Key First Name 25 Characters long Last Name 50 Characters long Address 60 Characters long City State 2 Characters long Default Value Zip Code Home Phone 10 Characters long Input Mask Charges Field Type Charge Amount Currency None Charge Date Date Input Mast Payments Payment Amount Payment Type Payment Date PaymentMethod MethodID MethodType 20 Characters long

2. Create the layout of the database What will be the primary key for each table? A field, or a collection of fields, whose values uniquely identify each record in a table

Research Papers Database Table Name: Client Field Type/ Data Type Properties   Fields: Client ID Text 5 Characters long Primary Key First Name 25 Characters long Last Name 50 Characters long Address 60 Characters long City State 2 Characters long Default Value Zip Code Home Phone 10 Characters long Input Mask Charges Field Type Charge Amount Currency None Charge Date Date Input Mast Payments Payment Amount Payment Type Payment Date PaymentMethod MethodID MethodType 20 Characters long