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Systems Analysis and Design (Shell...

11th Edition
Scott Tilley + 1 other
ISBN: 9781305494602

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BuyFindarrow_forward

Systems Analysis and Design (Shell...

11th Edition
Scott Tilley + 1 other
ISBN: 9781305494602
Textbook Problem

What e input masks� What are validation rules? Why are they important?

Program Plan Intro

Input masks, validation rules and their importance.

Program Explanation

Input mask:

  • An input mask is used to restrict the user to enter the information only in the format readable by the system.
  • It is a template, or a pre-defined format for the input.
  • For example, the date format must be dd-mm-yy.

Validation rules:

  • Validation is the process of finding correctness in data. In this process, the data entered by user is compared with set of rules.
  • A validation rule is like a quality check, which tests the input with a pre-defined set of conditions, or input masks, and rejects the input if the test returns failure.
  • For example if a user enters the salary in the name field, then this process informs user about the wrong entry.

There are eight data validation rules described below:

  1. Sequence check: Sequence check is performed on the data which is checked in an orderly or sequential manner.
  2. Existence check: Existence check uses only those data items, which are mandatory.
  3. Data type check: A data type check is a kind of validation that is used to ensure that the proper format is followed for the required data...

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