- Validation is a computer check to make sure data entered is sensible.
- There are different types of validation:
Presence Check: This is when you check that a field is not empty.
Range Check: This is when you check that data entered into a field is within the range e.g. 90<100.
Format Check: This is when you check the data is in the right format.
Lookup Table: This is when you lookup acceptable values in a table
Check Digit: Looking at the last two numbers to see if the rest of the numbers are valid.
Length Check: Making sure values entered aren't too long or short.
Spell Check: Making sure data entered is spelt correctly.
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