php - mysqli_query “INSERT into” -

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i use code dosen't insert data base..please me

mysqli_query($link,              "insert `usertable`(`id`, `username`, `password`)              values (null,'$username','$password')"         );   

mysqli_query("insert `usertable`(`username`, `password`)          values ('$username','$password')"     );

database set id auto-increment.


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