Question

What is data validation? Why is it necessary ? Also explain how Calc does it?

Answer 1

Answer:

In computer science, data validation is the process of ensuring data have undergone data cleansing to ensure they have data quality, that is, that they are both correct and useful. It uses routines, often called "validation rules" "validation constraints" or "check routines", that check for correctness, meaningfulness, and security of data that are input to the system. The rules may be implemented through the automated facilities of a data dictionary,[1] or by the inclusion of explicit application program validation