Validation is one way of trying to reduce the number of errors in the data being entered into your system.
The validation is performed by the computer at the point when you enter data. It is the process of checking the data against the set of validation rules which you set up when developing your new relational database or flat-file spreadsheet system.
DEFINITION: Validation aims to make sure that data is sensible, reasonable, complete and within acceptable boundaries.
It is critical that you understand what this definition means and can repeat it when asked in an examination question.
Students regularly say in exam answers that ‘validation checks that the data is correct’.
It does NOT!!
If you enter ‘Smithe’ instead of ‘Smith’ or ‘07/08/07’ instead of ‘08/07/07’ no amount of validation in the world will pick up that human error.
So while validation can help to reduce the number of errors when entering data, it cannot stop them – be very clear about that.
Challenge see if you can find out one extra fact on this topic that we haven't already told you
Click on this link: Database Validation
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