Validation and Verification : Presence Check

A presence check is the simplest method of validation. A presence check can be used on any field in a database and simply checks that some data has been entered into the field, i.e. that the field has not been left blank

Presence checks are used on important fields which must have data entered into them. For example every student in a school must be a member of a form. Therefore a presence check could be carried out on the form field in each student's record to ensure that each student is placed in a form. The check would not ensure that each student was in the correct form.

GCSE ICT Companion 04 - (C) P Meakin 2004