Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 12 - No. 46)
What is the primary function of a 'presence check' validation?
To ensure that data is of the correct data type.
To ensure that a field has a value entered.
To ensure that data is within a valid range.
To ensure the length of the input data is correct.
Explication
Presence checks are used to make sure a user enters a value into a particular field.