logical or boolean
Data stored in Boolean form can only be one of two available values. It is like- yes or no, on or off, true or false.
alphanumeric
This is a combination of letters, numbers and symbols.
This is also known as a string of text.
£4987 is expensive
DL61 ABC
@*!#
Alphanumeric is also 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
This is also known as a string of text.
£4987 is expensive
DL61 ABC
@*!#
Alphanumeric is also 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
3.14156
19.4
306.3745
3.14156
19.4
306.3745
integer
these are whole numbers, no bits, no decimal places
5
-45
1122334455667788991010
5
-45
1122334455667788991010
date
Can be stored in different ways and forms
In the UK we write the date in the form DD/MM/YYYY
In the US they use the form MM/DD/YYYY
I don't think you need an example!
In the UK we write the date in the form DD/MM/YYYY
In the US they use the form MM/DD/YYYY
I don't think you need an example!
currency
Software will automatically add £ or $ to data and include decimal places
£22.99
£22.99
Images/sound bites/video clips
Some databases will allow a images, sound and video clips to be stored.
A photo of a criminal and their finger prints
A photo of a criminal and their finger prints