Pivot two columns - sql

Question

I have data that looks likes:
stu_id
course_name
staff_name
1
Economics - 3
Kuzma, Brian
1
History
Hulings, Kreg
1
IHS IB Lit of Americ
Duncan, Amy
2
Marine Biology A
Crews, Erin
2
Pre-Calculus
Soderholm, Lodi
2
Environ & Wld Iss
Haberman, Helen
I am trying format it as such using SQL, so that each student's data is all in one row:
stu_id
course1
staff1
course2
staff2
etc ...
1
Economics - 3
Kuzma, Brian
History
Hulings, Kreg
etc ...
2
Marine Biology A
Crews, Erin
Pre-Calculus
Soderholm, Lodi
etc ...
Each student can have up to 6 courses and associated staff names all pivoted to a single row.
The basic query is:
SELECT dtbl_students.student_id stu_id,
course_name,
staff_name
FROM k12intel_dw.ftbl_student_schedules
INNER JOIN k12intel_dw.dtbl_students WITH (nolock)
ON ftbl_student_schedules.student_key = dtbl_students.student_key
INNER JOIN k12intel_dw.dtbl_staff WITH (nolock)
ON ftbl_student_schedules.staff_key = dtbl_staff.staff_key
INNER JOIN k12intel_dw.dtbl_courses WITH (nolock)
ON ftbl_student_schedules.course_key = dtbl_courses.course_key
INNER JOIN k12intel_dw.dtbl_schools WITH (nolock)
ON ftbl_student_schedules.school_key = dtbl_schools.school_key
INNER JOIN k12intel_dw.dtbl_school_dates period_date WITH (nolock)
ON ftbl_student_schedules.school_dates_key =
period_date.school_dates_key
WHERE local_school_year = '2019-2020'
AND local_semester = 3
I am attempting to pivot on course_name and staff_name.
I have managed to UNPIVOT as such:
WITH Courses
AS (SELECT dtbl_students.student_id stu_id,
course_name,
staff_name
FROM K12intel_dw.FTBL_STUDENT_SCHEDULES
INNER JOIN K12intel_dw.DTBL_STUDENTS WITH (Nolock)
ON FTBL_STUDENT_SCHEDULES.STUDENT_KEY =
DTBL_STUDENTS.STUDENT_KEY
INNER JOIN K12intel_dw.DTBL_staff WITH (Nolock)
ON FTBL_STUDENT_SCHEDULES.staff_KEY =
DTBL_staff.staff_KEY
INNER JOIN K12intel_dw.DTBL_COURSES WITH (Nolock)
ON FTBL_STUDENT_SCHEDULES.COURSE_KEY =
DTBL_COURSES.COURSE_KEY
INNER JOIN K12intel_dw.DTBL_SCHOOLS WITH (Nolock)
ON FTBL_STUDENT_SCHEDULES.SCHOOL_KEY =
DTBL_SCHOOLS.SCHOOL_KEY
INNER JOIN K12intel_dw.DTBL_SCHOOL_DATES period_date WITH (
Nolock)
ON FTBL_STUDENT_SCHEDULES.SCHOOL_DATES_KEY =
period_date.SCHOOL_DATES_KEY
WHERE local_school_year = '2019-2020'
AND local_semester = 3)
SELECT *
FROM Courses
UNPIVOT ( Course
FOR Value IN ([course_name],
[staff_name]) ) unpiv
Which produces something like:
stu_id
course
value
1
IHS IB Economics - 3
course_name
1
Kuzma, Brian
staff_name
1
IHS IB History of th
course_name
1
Hulings, Kreg
staff_name
I have been experimenting with an unpivot then pivot or two pivots, using all the examples I can find on stack Overflow and elsewhere, but have had no success.

Answer 1

If you have a know or maximum number of pairs AND you want to try the PIVOT
Example
Select *
From (
Select A.stu_id
,B.*
From (
Select *
,RN = row_number() over (partition by stu_id order by course_name)
from YourTable
) A
Cross Apply ( values (concat('course_',RN),course_name)
,(concat('staff_',RN),staff_name)
) B(Item,Value)
) src
Pivot (max(Value) for Item in ([Course_1],[Staff_1],[Course_2],[Staff_2],[Course_3],[Staff_3] )) pvt
Returns

Answer 2

I would suggest row_number() to enumerate the columns, then conditional aggregation:
select
stu_id,
max(case when rn = 1 then course_name end) course1,
max(case when rn = 1 then staff_name end) staff1,
max(case when rn = 2 then course_name end) course2,
max(case when rn = 2 then staff_name end) staff2,
...
max(case when rn = 6 then course_name end) course6,
max(case when rn = 6 then staff_name end) staff6
from (
select t.*, row_number() over(partition by stu_id order by course_name) rn
from mytable t
) t
group by stu_id
This gives you 6 pairs of columns for each stu_id, with the corresponding course and staff names. Courses are sorted alphabetically over the columns. If a student has less than 6 courses, the final columns will be empty.
I am quite unclear on how your query and your sample data relate. This answer is based on the sample data and expected results.