An<u> existence check</u> is a data validation rule that should be applied to mandatory data articles.
<h3>What are the rules of data validation?</h3>
What are data validation rules Data validation rules control what constants can be joined into a cell, e.g. any whole number between 0 and 9, or one of several values from another part of the spreadsheet
<h3>What is a presence check?</h3>
A method of verification that checks if the user has entered some data. This is sometimes described as a “required field” when completing an online form. Reality checks are important as they help to avoid accepting partial information which cannot be rectified later.
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Complete question is,
• A synchronic check
• Range check
• Sequence check
• Existence check
