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Logical or Boolean

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. FALSE. 0. F. NO. Alphanumeric.

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Logical or Boolean

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

  2. Alphanumeric • Alphanumeric data is any combination of letters, numbersand 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 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 decimalplaces. • Examples: 3.14175 18.01 12.4

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

  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/YYYYe.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.

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