same data inserted 2 times in database

same data inserted 2 times in database
same data inserted 2 times in database pls help me, i have table studentmaster(firstname,lastname,fathername,phone,address). i am inserting data into database 2 times the data will be inserted. forexample: firstname

same data inserted 2 times
same data inserted 2 times thanks for reply, i know the insert command. but same data inserted 2 times.where is the problem i cannot understood

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Display error message if data is already inserted in database
Display error message if data is already inserted in database Display error message if data is already inserted in database Pls help me Thanks

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