Hi Ashok,
This function are the basics one's which are used in Excel basically; apart form there you can find them in any other programming language.
condidition
If then else
if <specify a condition> then <what to do if pass> else <wt to do if fail>
you can use any of the above specifited link or just search for any of these function in google you will find some of the best ways to understand these by examples
Cheers,
Cherry.
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