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Databases,Tables, Views, Indexing and SQL syntax
I have "student.dbf" with field 1.regno 2.applno 3. Name 4.course.
How to prevent duplicate entry when i entering data entry? for example the applno "21005" is already exists in my table, by mistakenly again I enter same applno the message box tell record already exist, Do you want to continue is yes mean allow or if no means clear text boxes value.
How to do this?
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