selecting data from table one table and insert into another table - php

Question

I have two tables; result and total.
result(student_code,mark)
total(student_code,total)
The total column should contain total marks of a student.
So I have written an SQL statement to insert data from result table into total table by using a SELECT statement which should take a specific student_code and his/her marks as a summation and then store it in the total table.
But, whenever I try, the query either fails or just takes only one student
When I use this query, it works but for only one student, whose student_code is 1, but I need to take all the students and their marks as total
<?php
// copy student student_code and summation of his/her mark from result table into total table
$query = 'INSERT INTO total
(student_code, total)
SELECT student_code, SUM(mark)
FROM
result
WHERE
student_code = 1';
$sql = mysql_query($query) or (mysql_error());
?>
And when I use a student code as a variable I get nothing
<?php
// copy student student_code and summation of his/her mark from result table into total table
$query = 'INSERT INTO total
(student_code, total)
SELECT student_code, SUM(mark)
FROM
result
WHERE
student_code = "' . $student_code . '"';
$sql = mysql_query($query) or (mysql_error());
?>

Answer 1

You must perform two different queries first query selects the data and then store it to a php variable and then later insert it into another table using the second query
UPDATE----
Try this code
<?php
for($i = 1; $i < 102; $i++)
{
$query = 'INSERT INTO total (student_code, total) SELECT student_code, SUM(mark) FROM result WHERE student_code = "$i"';
$sql = mysql_query($query) or (mysql_error());
}
?>
It must work