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substr(Middle_Name, 1, 1) would convert the data from the second system to look like the data from the first 'Doe, John Q'Checks the data type of the input and give an error message if the input data does not match with the chosen data type, e.g., In an input box accepting numeric data, if the letter 'O' was typed instead of the number zero, an error message would appear.The rules may be implemented through the automated facilities of a data dictionary, Data validation is intended to provide certain well-defined guarantees for fitness, accuracy, and consistency for any of various kinds of user input into an application or automated system.

The computer checks this calculation when data are entered.

A validation process involves two distinct steps: (a) Validation Check and (b) Post-Check action.

The check step uses one or more computational rules (see section below) to determine if the data is valid.

Code and cross-reference validation includes tests for data type validation, combined with one or more operations to verify that the user-supplied data is consistent with one or more external rules, requirements, or validity constraints relevant to a particular organization, context or set of underlying assumptions.

These additional validity constraints may involve cross-referencing supplied data with a known look-up table or directory information service such as LDAP.

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