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Asked: 2026-05-23T20:13:31+00:00

Currently, the codes I’ve done below are the codes that will only display the

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Currently, the codes I’ve done below are the codes that will only display the courses that have a tutor_id assigned to them. However, what I want is to display the courses that are not assigned the tutor_id as well as ‘No tutor has been assigned to this course’. Tutor_id is a NULL variable in the database.

(storing in navigation pages)

$arrItems = executeSelectQuery("SELECT * FROM course, category, tutor WHERE course.Category_id = category.Category_id AND course.Tutor_id = tutor.Tutor_id");

$totalDesign = executeSelectQuery("SELECT * FROM course, category, tutor WHERE course.Category_id = category.Category_id AND course.Tutor_id = tutor.Tutor_id");
$numrows = count($totalDesign);

$arrItems = executeSelectQuery("SELECT * FROM course, category, tutor WHERE course.Category_id = category.Category_id AND course.Tutor_id = tutor.Tutor_id ORDER BY course.Course_name ASC LIMIT $offset, $rowsPerPage");
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1 Answer

  1. Editorial Team
    SELECT * FROM course
INNER JOIN category ON course.Category_id = category.Category_id
OUTER JOIN tutor ON course.Tutor_id = tutor.Tutor_id 
ORDER BY course.Course_name ASC LIMIT $offset, $rowsPerPage

    Outer join provides just the functionality you are after. All
    courses will be selected with some containing null values in the
    Tutor_id field. Identify when this happens in your code and print
    “No tutor has been assigned to this course” on these occasions.

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