where case when...

får inte till denna:
om @Level3 = 0 då får inte ParentIdno vara lika som SubIDno.

felkod: Incorrect syntax near '<'.

ALTER   Procedure upCategory
	@CategoryId int, 
	@Level3 int

As
	Set NoCount On
	
	Select a.IDno, a.ParentIDno, a.TopIDno, a.SubIDno, a.Fullname, a.Enabled, a.CreateDate
	From Category a
	Where Case When @Level3=0 Then ParentIDno <> SubIDno End
	Order By a.TopIDno, a.SubIDno, a.ParentIDno, a.Fullname