IDENTITY full-time and part-time students - oracle

Question

have a query and test CASE that shows the number of full-time and part-time students. A full-time student is enrolled in at least 4 courses. A part-time student is enrolled in at least 1 course, but no more than 3.
Although the query appears to work it seems a bit verbose. I was wondering if there is a more succinct way to rewrite the query. In addition, I can would like to display the students first/last names with each row that meets the criteria
Perhaps with something like this?
, LISTAGG(
NVL2(s.student_id, s.last_name || ', ' || s.first_name, NULL),
'; '
) WITHIN GROUP (ORDER BY s.last_name, s.first_name) AS students
Below are my tables, data and query I would like to shorten if possible. Thanks to all who answer and for your expertise.
CREATE TABLE students(student_id, first_name, last_name) AS
SELECT 1, 'Faith', 'Aaron' FROM dual UNION ALL
SELECT 2, 'Lisa', 'Saladino' FROM dual UNION ALL
SELECT 3, 'Leslee', 'Altman' FROM dual UNION ALL
SELECT 4, 'Patty', 'Kern' FROM dual UNION ALL
SELECT 5, 'Beth', 'Cooper' FROM dual UNION ALL
SELECT 95, 'Zak', 'Despart' FROM dual UNION ALL
SELECT 96, 'Owen', 'Balbert' FROM dual UNION ALL
SELECT 97, 'Jack', 'Aprile' FROM dual UNION ALL
SELECT 98, 'Nicole', 'Kramer' FROM dual UNION ALL
SELECT 99, 'Jill', 'Coralnick' FROM dual;
CREATE TABLE student_courses (student_id,course_id) AS
SELECT 1, 1 FROM dual UNION ALL
SELECT 2, 1 FROM dual UNION ALL
SELECT 3, 1 FROM dual UNION ALL
SELECT 4, 1 FROM dual UNION ALL
SELECT 5, 1 FROM dual UNION ALL
SELECT 1, 2 FROM dual UNION ALL
SELECT 2, 2 FROM dual UNION ALL
SELECT 3, 2 FROM dual UNION ALL
SELECT 4, 2 FROM dual UNION ALL
SELECT 5, 2 FROM dual UNION ALL
SELECT 1, 3 FROM dual UNION ALL
SELECT 2, 3 FROM dual UNION ALL
SELECT 3, 3 FROM dual UNION ALL
SELECT 4, 3 FROM dual UNION ALL
SELECT 5, 3 FROM dual UNION ALL
SELECT 97, 1 FROM dual UNION ALL
SELECT 97, 3 FROM dual UNION ALL
SELECT 97, 5 FROM dual UNION ALL
SELECT 97, 6 FROM dual UNION ALL
SELECT 98, 3 FROM dual UNION ALL
SELECT 98, 4 FROM dual UNION ALL
SELECT 98, 5 FROM dual UNION ALL
SELECT 99, 2 FROM dual UNION ALL
SELECT 99, 4 FROM dual UNION ALL
SELECT 99, 5 FROM dual UNION ALL
SELECT 99, 6 FROM dual;
WITH enrolled_student_course_counts AS (
SELECT
s.student_id
, s.first_name
, s.last_name
, COUNT(sc.course_id) AS course_count
FROM students s
LEFT JOIN student_courses sc
ON s.student_id = sc.student_id
GROUP BY
s.student_id
, s.first_name
, s.last_name
HAVING COUNT(sc.course_id) > 0
)
, student_enrollment_statuses AS (
SELECT
student_id
, first_name
, last_name
, CASE WHEN course_count >= 4 THEN 'full-time'
WHEN course_count BETWEEN 1 AND 3 THEN 'part-time'
END AS student_enrollment_status
FROM enrolled_student_course_counts
)
SELECT
UPPER(student_enrollment_status) AS student_enrollment_status
, COUNT(student_enrollment_status) AS student_enrollment_status_count
FROM student_enrollment_statuses
GROUP BY student_enrollment_status;

Answer 1

As you only need the numbers (and not any other data), shorten the query so that it searches only the student_courses table:
SQL> with temp as
2 (select student_id,
3 count(course_id) cnt
4 from student_courses
5 group by student_id
6 )
7 select
8 sum(case when cnt < 4 then 1 else 0 end) part_time,
9 sum(case when cnt >= 4 then 1 else 0 end) full_time
10 from temp;
PART_TIME FULL_TIME
---------- ----------
6 2
SQL>