SQL Server Parent/Child CTE Ordering issue revisited

Question

Yesterday, I posted this issue regarding Parent/Child ordering that I thought had been resolved.

The resultant query that worked for a while was:

S         


        

Answer 1

What you can do is use a Revursive CTE to find the RootId which you can then use in the ORDER BY

;WITH c AS 
(
    SELECT NoteId, NoteId ParentNoteId, NoteId AS RootId, t.NoteText
    FROM tbl 
    WHERE ParentNoteId = 0 

    UNION ALL 

    SELECT t.NoteId, t.ParentNoteId, c.RootId, t.NoteText
    FROM tbl AS t 
    INNER JOIN c ON t.ParentNoteId = c.NoteId 
    WHERE t.NoteId <> 0
) 
SELECT 
    c.NoteId, 
    CASE WHEN c.ParentNoteId = c.NoteId THEN 0 ELSE c.ParentNoteId END AS ParentId, 
    c.NoteText
FROM c
ORDER BY RootId, ParentNoteId, NoteId

Which give a result like (text ommitted)

NoteId  ParentId
--------------------
23471   0
23472   23471
23473   23471
23478   23471
23481   23471
23474   23472
23475   23474
23476   0
23477   23476
23482   23476
23484   23482
23485   23482
23486   23482
23487   23482
23480   0

demo