1. Logical or Boolean Data stored in Boolean form can only be one of two available values. Think of a light switch – it’s on or off. Examples include: YES TRUE 1 1 FALSE NO 0 0 M M F F

2. Alphanumeric Alphanumeric data is any combination of letters, numbers and symbols (@#¬|\/>< etc.) This data type is also known as a string or text. Examples: £4987 is a lot to pay for a badger I like fish DL61 ABC @*!#

3. Alphanumeric Continued… Alphanumeric or text/string is used to hold telephone numbers. In a computer, telephone numbers are stored as text. This is because the telephone number contains a leading zero and spaces.

4. Real A real number is one which has decimal places. Examples: 3.14175 12.4 18.01

5. Integer Integer numbers are whole numbers, no bits, no decimal places. Examples: 5 5 999999 -54

6. Date Dates can be stored in many different forms. In the UK we write the date in the form DD/MM/YYYY e.g. 31/12/2014. In the US, they use the form MM/DD/YYYY e.g. 12/31/2014. Examples: 15/08/1999 2009/11/30 12/31/1999

7. Other Data Types Currency – Software will automatically add £ or $ to data and include decimal places. E.g. £22.99. Image – Some databases will allow an image to be stored, for example a photo of a criminal and their fingerprints on a crime database.