sql How to hide row if entire row value is 0 - mysql

Question

My Query :
SELECT
(ref_intake.intakeno) AS intake,
SUM(CASE WHEN(student.intakeid AND student.status = '3' AND (student.courseid=3 OR student.courseid=17)) THEN 1 else 0 END) as active,
SUM(CASE WHEN(student.intakeid AND student.status = '5' AND (student.courseid=3 OR student.courseid=17)) THEN 1 else 0 END) as deffered,
SUM(CASE WHEN(student.intakeid AND student.status = '16' AND (student.courseid=3 OR student.courseid=17)) THEN 1 else 0 END) as inactive,
SUM(CASE WHEN(student.intakeid AND student.status = '9' AND (student.courseid=3 OR student.courseid=17)) THEN 1 else 0 END) as missing,
SUM(CASE WHEN(student.intakeid AND student.status = '6' AND (student.courseid=3 OR student.courseid=17)) THEN 1 else 0 END) as widthdrawn,
SUM(CASE WHEN(student.intakeid AND student.status IN (18,7,36) AND (student.courseid=3 OR student.courseid=17)) THEN 1 else 0 END) as dis_ter_dereg
FROM student
LEFT JOIN ref_intake ON student.intakeid = ref_intake.intakeid
GROUP BY student.intakeid ORDER BY ref_intake.intakeno ASC
The the image is my result:

Answer 1

I do suspect that your query can be simplified as follows:
SELECT
s.intakeid AS intake,
SUM(CASE WHEN s.status = 3 THEN 1 ELSE 0 END) as active,
SUM(CASE WHEN s.status = 5 THEN 1 ELSE 0 END) as deffered,
SUM(CASE WHEN s.status = 16 THEN 1 ELSE 0 END) as inactive,
SUM(CASE WHEN s.status = 9 THEN 1 ELSE 0 END) as missing,
SUM(CASE WHEN s.status = 6 THEN 1 ELSE 0 END) as widthdrawn,
SUM(CASE WHEN s.status IN (18, 7, 36) THEN 1 ELSE 0 END) as dis_ter_dereg
FROM student s
INNER JOIN ref_intake ri ON s.intakeid = ri.intakeid
WHERE
s.intakeid
AND s.status IN (3, 5, 16, 9, 6, 18, 7, 36)
AND s.courseid IN (3, 17)
GROUP BY s.intakeid
ORDER BY ri.intakeno ASC
That is:
most conditions can be moved to the WHERE clause - this should actually remove rows where no condition matches
it seems like you actually want an INNER JOIN rather than a LEFT JOIN - but you can revert that change if needed
table aliases make the query easier to read and write
ORed conditions can be simplified to use IN