
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 lastname fathername phone address mithu tum vinay 80055 ban mithu tum vinay 80055 ban

Post the sql query which you have used.
Anyways, try the following:
insert into studentmaster(firstname,lastname,fathername,phone,address) values('aaaa','bbbb,'cccc',1111,'delhi');
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