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check particular cell value and not insert again new value
Kanaparthi Sureshma Reddy
Jul 8 2015 3:27 AM
471
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Hi,
In my database I have 3 columns ie., Id,Name,Subject(Marks).I inserted records as 1,Sai, 20.
When I am trying to insert new marks to the Sai ,it won't accept new marks to the Sai.
That means I want to restrict to re-enter the marks for particular record and it allows only one time to enter marks..
How to write code for this.. ??
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