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I have an SQL DB. I have a Canvas App with a Gallery that is bound to a table of the DB. Among others, there is a Text input in the Gallery that is bound to a column of the DB table.
I want to add the following improvement into my App: do not allow end-user to duplicate a value in this Text input. In other way, if end-user tries to enter a value that already exists in some other row of the gallery in this field, an error message about that should be displayed.
How could I implement this?
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