information & communications technology an introduction to databases
TRANSCRIPT
STANDARD GRADE STANDARD GRADE ADMINISTRATIONADMINISTRATION
Information & Communications
Technology
An Introduction to Databases
What is a Database?
An information centre
Computerised filing system
A collection of related information
What is a Database?
Pupil Records
File
Record 1
Record 2
Record 3
What is a Record?
Forename
Surname
Date of BirthEmployee Number
ROBBIE
WILLIAMS
23/08/1973
1985
Fields
What type of Field?
Name
Date of Birth
Salary
Employee Number
Text
Date
Currency
Number
First Name Second Name Date of Birth Staff Number Yearly Salary
Derek Longmuir 11/08/1970 1 £25,000.00
Lisa Smith 21/03/1975 2 £28,500.00
Martin Cawston 13/06/1979 3 £19,750.00
Jillian Thomson 17/05/1981 4 £21,200.00
In this example, there are 5 fields.
There are 4 records in this one file.
Record 1
Record 2
Record 3
Record 4
Field Types
First Name Second Name Date of Birth Staff Number Yearly Salary
Derek Longmuir 11/08/1970 1 £25,000.00
Lisa Smith 21/03/1975 2 £28,500.00
Martin Cawston 13/06/1979 3 £19,750.00
Jillian Thomson 17/05/1981 4 £21,200.00
text text date number currency
Sorting Records
First Name Second Name Date of Birth Staff Number Yearly Salary
Derek Longmuir 11/08/1970 1 £25,000.00
Lisa Smith 21/03/1975 2 £28,500.00
Martin Cawston 13/06/1979 3 £19,750.00
Jillian Thomson 17/05/1981 4 £21,200.00
It might be a good idea to sort the records in the database in order of what?
Sorting Records
First Name Second Name Date of Birth Staff Number Yearly Salary
Martin Cawston 13/06/1979 3 £19,750.00
Derek Longmuir 11/08/1970 1 £25,000.00
Lisa Smith 21/03/1975 2 £28,500.00
Jillian Thomson 17/05/1981 4 £21,200.00
Here, the records have been sorted in alphabetical order of Second Name.
How else could they be sorted?
Searching Records
•Databases hold lots of information.
•Sometimes it is good to search or query a database to find certain pieces of information.
•For example, how many staff members earn £25,000 or over???
Searching Records
First Name Second Name Date of Birth Staff Number Yearly Salary
Derek Longmuir 11/08/1970 1 £25,000.00
Lisa Smith 21/03/1975 2 £28,500.00
•Here are the records which have been searched or queried for.
•They have been sorted into alphabetical order of Second Name.
•Can you think of examples where this might be handy?