How to calculate Total records Counts in table with my scenario - sql

Question

I am Writing a SQL Code which basically count stars values Like ratings Feedback forms.To calculate how many peoples rate
1 star,2,3 and so on i am using pivot unpivot SQL properties to calculate count against of each number hits.Now i want to calculate count of all records in the table along with my this query.
i want to achieve my desire result without sub-query.
WITH survey AS (
SELECT
*
FROM
(
SELECT
student_id,
performance,
teacher_behaviour,
survey_id
FROM
survey_feedback
WHERE
survey_id = 1
GROUP BY
student_id,
performance,
teacher_behaviour,
survey_id
) UNPIVOT ( star
FOR q
IN ( performance AS 'PERFORMANCE',
teacher_behaviour AS 'TEACHER_BEHAVIOUR'
) )
ORDER BY
1,
2
)
SELECT
*
FROM
survey PIVOT (
COUNT ( student_id )
FOR star
IN ( 1, 2, 3, 4, 5 )
)
ORDER BY
q;
enter image description here

Answer 1

Hmmm . . . I'm not a fan of PIVOT and UNPIVOT. They really offer no new functionality and are quite bespoke and not powerful enough.
So, I would just unpivot and use conditional aggregation:
SELECT survey_id, which, COUNT(rating) as total,
SUM(CASE WHEN rating = 1 THEN 1 ELSE 0 END) as rating_1,
SUM(CASE WHEN rating = 2 THEN 1 ELSE 0 END) as rating_2,
SUM(CASE WHEN rating = 3 THEN 1 ELSE 0 END) as rating_3,
SUM(CASE WHEN rating = 4 THEN 1 ELSE 0 END) as rating_4,
SUM(CASE WHEN rating = 5 THEN 1 ELSE 0 END) as rating_5
FROM (SELECT sf.*,
(CASE WHEN which = 'PERFORMANCE' THEN performance
WHEN which = 'TEACHER_BEHAVIOUR' THEN teacher_behavior
END) as rating
FROM survey_feedback sf CROSS JOIN
(SELECT 'PERFORMANCE' as which FROM DUAL UNION ALL
SELECT 'TEACHER_BEHAVIOUR' FROM DUAL
) n
) sf
WHERE sf.survey_id = 1
GROUP BY sf.survey_id, which;
In Oracle 12C+, I would use a lateral join for unpivoting.