Bez CTE můžete:
Select Z.Department, Z.AvgWage
From (
Select Department, Avg(Wage) AvgWage
From Employees
Group By Department
) As Z
Where AvgWage = (
Select Max(Z1.AvgWage)
From (
Select Department, Avg(Wage) AvgWage
From Employees
Group By Department
) Z1
)
S CTE můžete udělat:
With AvgWages As
(
Select Department
, Avg(Wage) AvgWage
, Rank() Over( Order By Avg(Wage) Desc ) WageRank
From Employees
Group By Department
)
Select Department, AvgWage, WageRank
From AvgWages
Where WageRank = 1