Will limit display to student ID # 1 and exclude everything else

Question

`` $query = "SELECT t1.ID,t1.student_id, t1.Subject, t1.1st_Grading, t1.2nd_Grading, t1.3rd_Grading, t1.4th_Grading, t1.Status, SUM(t1.1st_Grading t1.2nd_Grading t1.3rd_Grading t1. 4th_Grading) / 4 as Average FROM grading_system t1 LEFT JOIN studentdata t2 ON t1.student_Id = t2.ID GROUP BY t1.ID ";

This is the result of this code, if you see the red arrow in the url, it is a student#1, which also includes student#2 items

![](https://i.stack.imgur.com/5wS7h.png)

Answer 1

When the user clicks on the link with student ID 1, the parameter id in the link will be obtained, and then the global variable $_GET['id'] is used in PHP to query the database, and the WHERE clause is used in the query.

// Get the student ID from the URL parameter
$studentId = isset($_GET['id']) ? $_GET['id'] : null;


// Prepare the SQL query with the WHERE clause to fetch the specific student's data
$query = "SELECT t1.ID, t1.student_id, t1.Subject, t1.1st_Grading, t1.2nd_Grading, t1.3rd_Grading, t1.4th_Grading, t1.Status, 
          SUM(t1.1st_Grading + t1.2nd_Grading + t1.3rd_Grading + t1.4th_Grading) / 4 as Average 
          FROM grading_system t1 
          LEFT JOIN studentdata t2 ON t1.student_Id = t2.ID 
          WHERE t1.student_id = $studentId
          GROUP BY t1.ID";