把
$query = 'select count(course_id), course_id'
. ' from record'
. ' group by course_id'
. ' order by count(course_id) ';
改為
$query = 'select count(course_id) as count_course, course_id'
. ' from record'
. ' group by course_id'
. ' order by count_course ';
這樣應該就可以了~
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