Getting the primary (main), secondary and tertiary function for an emolyee - sql

Question

I have the following query to get the primary (main) and secondary function for each employee :
with
employeeScopeFunctions as (
select e.employeeId,
es.FunctionId,
ef.Label,
c.CompanyName,
realOrder = row_number() over(
partition by e.employeeId
order by isnull(es.sortOrder, 9999)
)
from employee e
LEFT JOIN employee_scope es on es.employeeId = e.employeeId
LEFT JOIN employee_function ef on es.FunctionId = ef.FunctionId
LEFT JOIN Company c ON es.CompanyId = c.ID
WHERE e.EmployeeId=54
)
select *,
primacy = iif(realOrder = 1, 'main', 'secondary')
from employeeScopeFunctions
For the EmployeeId=54 the result is like below :
EmployeeId FunctionId Label CompanyName realOrder Primacy
54 273 Group Chief Executive Officer C1 1 primary
54 273 Group Chief Executive Officer C2 2 secondary
54 273 Group Chief Executive Officer X5 3 secondary
54 897 Group Regional Chief Executive Officer X6 4 secondary
54 897 Group Regional Chief Executive Officer F6 5 secondary
54 39 Director VY 6 secondary
54 39 Director G7 7 secondary
What I want to get is regroup all the companies for a specific function and get three levels of primacy :
EmployeeId FunctionId Label CompanyName Primacy
54 273 Group Chief Executive Officer C1,C2,X5 primary
54 897 Group Regional Chief Executive Officer X6,F6 secondary
54 39 Director VY,G7 tertiary

Answer 1

If I followed you correctly, you could keep your existing CTE and turn on aggregation in the main query. ROW_NUMBER() can be used to rank the records by increasing realOrder.
This should work in SQL-Server:
WITH employeeScopeFunctions as (
SELECT
e.employeeId,
es.FunctionId,
ef.Label,
c.CompanyName,
realOrder = row_number() over(partition by e.employeeId order by isnull(es.sortOrder, 9999))
FROM
employee e
LEFT JOIN employee_scope es ON es.employeeId = e.employeeId
LEFT JOIN employee_function ef ON es.FunctionId = ef.FunctionId
LEFT JOIN company c ON es.CompanyId = c.ID
WHERE e.EmployeeId=54
)
SELECT
employeeId,
FunctionId,
Label,
CompanyName = STRING_AGG(CompanyName, ',') WITHIN GROUP (ORDER BY realOrder),
Primacy = CASE ROW_NUMBER() OVER(ORDER BY MIN(realOrder))
WHEN 1 THEN 'primary'
WHEN 2 THEN 'secondary'
WHEN 3 THEN 'tertiary'
END
FROM employeeScopeFunctions
GROUP BY
employeeId,
FunctionId,
Label
Alternative solution with an additional level of nesting to avoid nesting window function and aggregation:
WITH employeeScopeFunctions as (
SELECT
e.employeeId,
es.FunctionId,
ef.Label,
c.CompanyName,
realOrder = row_number() over(partition by e.employeeId order by isnull(es.sortOrder, 9999))
FROM
employee e
LEFT JOIN employee_scope es ON es.employeeId = e.employeeId
LEFT JOIN employee_function ef ON es.FunctionId = ef.FunctionId
LEFT JOIN company c ON es.CompanyId = c.ID
WHERE e.EmployeeId=54
)
SELECT
employeeId,
FunctionId,
Label,
CompanyName,
Primacy = CASE ROW_NUMBER() OVER(ORDER BY minRealOrder)
WHEN 1 THEN 'primary'
WHEN 2 THEN 'secondary'
WHEN 3 THEN 'tertiary'
END
FROM (
SELECT
employeeId,
FunctionId,
Label,
CompanyName = STRING_AGG(CompanyName, ',') WITHIN GROUP (ORDER BY realOrder),
minRealOrder = MIN(realOrder)
FROM employeeScopeFunctions
GROUP BY
employeeId,
FunctionId,
Label
) x