Question

i want to record a user inputed value and at the same time copy a single data from another table. is it possible?

here is my code:

$sql="INSERT INTO grades (studentnumber,subjectcode)
VALUES
('$_POST[studentnumber]','$_POST[subjectcode]')";

$sql="INSERT INTO grades (course) SELECT course FROM students WHERE studentnumber= '$_POST[studentnumber]'";

if (!mysql_query($sql,$con))
  {
  die('Error: ' . mysql_error());
  }
echo "<script type='text/javascript'>alert('Record Successfully Added'); location.href = '../instructor/cvsu-sis_students.php';</script>";

thanks in advance and sorry for my elementary question.

Answer 1

You can do it in one query if that’s what you are asking about, also remember to escape the strings to avoid SQL Injection:

$P_studentnumber=mysql_real_escape_string($_POST['studentnumber']);
$P_subjectcode=mysql_real_escape_string($_POST['subjectcode']);

$sql="INSERT INTO grades (studentnumber,subjectcode,course) SELECT '$P_studentnumber','$P_subjectcode',course FROM students WHERE studentnumber='$P_studentnumber'";

if (!mysql_query($sql,$con))
{
   die('Error: ' . mysql_error());
}
echo "<script type='text/javascript'>alert('Record Successfully Added'); location.href = '../instructor/cvsu-sis_students.php';</script>";