Data, Information, Knowledge and Processing. #2

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  • Created by: Joe
  • Created on: 05-05-10 17:07

Part 2 of these notes will cover:

  • Data types and data sources.

For the previous version of these notes that cover Data, Information and Knowledge please see:

Data types:

Data can be grouped into 'Data Types'. There are five of these data types you will need to know:

  • Boolean
  • Real
  • Integer
  • Text/String
  • Date/Time


The boolean data type allocates one of two values - true and false. These values can be used to represent anything with two states such as "Male/Female", "Yes/No" or "L6th/U6th".

This can hold data where the response can only be one of these two values and is usually phrased as a closed question such as:

"Are you Male?" or "Does the property have a garage?"


This data type contains numbers which will have decimal places. For example: "45.78", "123.405" and "12.00" It is used to hold numbers where precision is important such as:

  • Measurements in a house or building (2.7m wide)
  • Height of a person. (1.82m)
  • Price of goods (£199.99)


The integer data type contains whole numbers with NO decimal places, for example: "45", "125" or "14945".

It is used where accuracy may not be relevant, of vital importance or the value is specifically a whole number. For example:

  • Tv Channels
  • Large amounts of money (House prices)

Currency may be a real or an integer. If it is a relatively small amount then it will be real (£16.99), however if the amount is large then it…


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