Validating accuracy of web server statistics
Example: If a data type is set to be ‘numeric’, then all other types, such as a character(s) will be denied with an error.
Data validation can be implemented during the design process of a database by setting data requirements for the user input to avoid errors.
If the required property is set for a certain field but the user attempts to leave it blank, they will be prompted with an error message, requiring data to be entered before going any further.
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Finally, the primary key constraint is a mixture of the unique constraint and the not null constraint meaning the no two rows can have the same values in their columns and that a column must have data.
Referential integrity is a key aspect in data integrity that is usually associated with two tables; the lookup table and the data table.