validation

Question 1

what is validation?

Answer 1

an automatic computer check to ensure that the data entered is sensible and reasonable

Question 2

presence check

Answer 2

checks that data has been entered into a field

e.g. in most databases a key field cannot be left blank

Question 3

range check

Answer 3

check that a value falls within the specified range

e.g. number of hours must be less than 50 and more than 0

Question 4

length check

Answer 4

checks the data isn’t too short or too long

e.g. a password which needs to be six letters long