| Presence Check |
A check that makes sure some data fields are present.
Example:
An application for a passport must have the applicant's surname.
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| Range check |
A check to see if data lies within a specific range.
Examples:
The 'day' part of a date must be in the range 1..31
An exam grade should be in the range 'A'...'G'.
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| Type check |
Checks to see if data is of the right type
Examples:
Exam marks should be numbers (integers)
Exam grades should be letters.
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| Format check |
A check that data is in a particular format.
Example:
A postcode must be 2 letters, 2 digits, a space, a digit and 2
letters.
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| Look-up check |
A check that data is one of several different values.
Example :
A Gender code must be either "M" or "F"
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| Length check |
Checks to see if data has the correct number of characters
in it.
Examples:
Bank account numbers should be 8 characters.
Postcodes should be 4 characters... a space... and then 3 characters.
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