Question

<?php
include 'dbFunctions.php';
$courseid = $_GET['Course_id'];

$query = "SELECT * FROM course WHERE Course_id=".$courseid."";
$arrCourse = executeSelectQuery($query);

$query2 = "SELECT * FROM course_member WHERE Course_id=".$courseid."";

$result = mysqli_query($link,$query2) or die(mysqli_error($link));
?>

HTML body:

<?php
while ($row = mysqli_fetch_array($result)) {
?>

      <?php echo $row['member_id']
      ?>

      <?php
}
?>

this correctly prints the results of the member id that is involved in the selected course, however, i want to extract the first_name using the result generated that belong to another table called member.

been trying all the join queries but it didn’t work.

Answer 1

Sounds like you need to read up on the JOIN operation in SQL. The following query will return all the data you seem to need, from a single query:

SELECT * 
FROM course
INNER JOIN course_member ON course.id = course_member.course_id
INNER JOIN member ON member.id = course_member.member_id