Hi
Your question is not clear enough.
e.g1 you might want a warning message to come up if an existing value
is typed in.
e.g.2 you might want to enter data in a form and add it to the column
of data. The form won't add the entry if it already exists.
If I give the answer for eg1 and you want eg2 then my time is wasted.
Make your problem and question very clear.
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