AS ICT Validation

How validation is achieved...

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  • Created by: Amira
  • Created on: 15-05-12 20:54

Validation

Ensures that entered data is reasonable, complete, sensible and within the acceptable behaviour.

Range check: sets an upper and a lower boundary for the data; must lie between these two values

Type check: makes sure that the data entered is of the correct type (numeric, string, Boolean data/time)

 Picture check: data entered requires a combination of numbers and letter. Cannot be applied to type check

 Length check: ensures that the data cannot be more than a set number of characters

 Presence check: data must be entered into a field. Computer insist that a value is entered for that field 

Lookup check: takes the value entered and compares it against a list of values in a separate table

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