database ◦ a place where data can be stored and retrieved. objects ◦ an option you can...
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DATABASES
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Database◦ A place where data can be stored and retrieved.
Objects◦ An option you can manipulate. Eg. Tables, forms,
queries. Tables
◦ Tables are used to store the data being managed
Definitions
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Forms◦ Forms provide a way of displaying and entering
data. Reports
◦ Reports let you print or view data in a useful format
Queries◦ A way of storing and answering questions within
the database
Definitions
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Libraries Birth Papers Drivers Permits Passports Facebook
Examples of databases
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Advantages◦ No specific training required
Disadvantages◦ Data is often duplicated◦ Time consuming◦ Inconsistency of data◦ Data cannot be shared easily
Manual Databases
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A computerized database where data can be stored in a structured and organized way so that data can be retrieved much faster.
Database Management System
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Advantages◦ Information can be retrieved faster◦ Data duplication is reduced◦ Increased Security◦ Less errors◦ Reduces long term storage costs
Disadvantages◦ Specialized software needed◦ They can be expensive to implement and hard to
maintain◦ Sometimes time consuming
Computer Databases
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DATA TYPE PURPOSE
Text Used to store alphanumeric characters (letters or numbers). Et. Name, address, phone number, country
Number Used to store numbers with or without decimal places. Eg. Age, average, quantity.
Currency Used to store money values. Eg. Salary, price, discount
Date/Time Used to store date/time values. Eg. Date of bith, date joined, death date
Autonumber Creates automatic numbers. Eg. ID number
Memo Used to store long text notes or paragraphs. Eg. Remarks
Yes/No Used to store yes or no. eg. Pass or Fail
Data Types
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TABLES
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A table is a collection of records. It is made of a set of rows and columns The information entered into the database
is stored in a table
Attributes of tables
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A record is a collection of related fields. It contains a single row and many columns.◦ Eg. The record of a persons existence is a birth
paper. It contains one row but many fields that are related.FIRSTNAME, SURNAME, PLACE OF BIRTH, MOTHER, FATHER, HOSPITAL.Everything is related to the reason the person is in the database.
Records
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A field is a single column in a table that stores data.
A field can also be referred to as an attribute.◦ Eg. NAME, AGE, DATE OF BIRTH, PHONE NUMBER,
ADDRESS, SEX.
Fields
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It is the type of data that a field can store.◦ Eg. ◦ The AGE FIELD would store a number◦ The FIRST NAME FIELD would store text
Field Type or Data Type
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A field description describes what is in the field. The description helps other users of the database to understand what it is used for.
Field Description
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Design View◦ Where you design the database, label the fields,
choose the field type and enter a field description.
Database Views
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Datasheet View◦ Where you enter information into the database
that you created.
Database Views
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FIELD NAME DATA TYPE DESCRIPTION
STORM NAME TEXT NAME OF THE STORM
ORIGIN TEXT PLACE WHERE IT ORIGINATED
DATE OF ORIGIN DATE/TIME DATE STORM WAS FORMED
CATEGORY NUMBER CATEGORY FROM 1 TO 5
MAJOR HURRICANE YES/NO WHETHER THE STORM BECAME A MAJOR HURRICANE
Practical Exercise – Create the following Database
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Storm Name
Origin Date of Origin
Category Major Hurricane
Bertha Coast of Africa
3/07/2008 3 Yes
Dolly Caribbean Sea
20/07/2008 2 No
Gustave Winward Islands
25/08/2008 4 Yes
Hanna Leeward Islands
28/08/2007 2 No
Kyle Caribbean Sea
29/09/2007 2 No
Enter the following storms in the database.
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FIELD NAME DATA TYPE DESCRIPTION
First Name Text
Surname Text
Age Number
Primary School Text
Secondary School Text
Favourite Subject Text
Favourite time of Day Date/Time
Favourite Artist Text
Love School? Yes/No
Love Sleep Yes/No
Practical 2 – Create a database with the following fields
FILL THE TABLE WITH 10 PEOPLE
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Field Name Data Type Description
Customer ID Text Customer ID
Last Name Text Last Name
First Name Text First Name
Address Text Address
Birth Date Date/Time Date of Birth
Home Tel Text Home Telephone
Work Tel Text Work Telephone
Email Text Email Address
Gender Text Gender
Work Place Text Place of Employment
Practical 3 – Create the following database naming it “Video Club”
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Field Name Data Type Description
DvdID Text 6 Digit Unique Number
Title Text Enter Title
Typecode Text 2 digit code
Rated Text Rating
Mins Number Minutes
Cost Currency Cost of DVD
Quantity Number Quantity in Stock
Create a second table named DVD