Validations

What is a validation?

Computer checkdata

enteredcompletesensible

Validation TypesData Type or Format checkData is the right type e.g. real or integer number, text, Memo, Yes/No

Presence check Checks that important fields are not left blank

Length Checks/ Character countFixes the number of characters you can type into a field

Validation TypesRange ChecksNumbers must be of a certain range

Lookup lists / Drop down listsA list containing only certain values

Input Masks A special type of format check – data must be in a set form eg 03JAN

What software uses validations?

• Databases• Spreadsheets• Programming software eg javascript etc