Logical or Boolean Data stored in Boolean form

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 M NO FALSE 0 F

Alphanumeric • Alphanumeric data is any combination of letters, numbers and symbols (@#¬|/>< etc. ) • This data type is also known as a string or text. • Examples: I like fish £ 4987 is a lot to pay for a badger DL 61 ABC @*!#

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.

Real • A real number is one which has decimal places. • Examples: 3. 14175 18. 01 12. 4

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

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

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.