SQL Server 2014 Nested Blog comments sorting - sorting

Question

I'm trying to build a small blog allowing people to add comments..
For comments I prepared a table like this:
ID PostID ParentID Date Title Text User ....
1 1 0
2 2 0
3 1 0
4 1 1
5 1 1
6 1 4
7 1 1
8 1 5
9 1 8
where if ParentID is not 0 means that this comment is not referred to the post but to the comment with that ID (is nested)
ie: assuming to select Post 1 will extract all comments except ID=2.
we have posts 1 and 2 on the root
posts 4,5,7 are nested in comment 1
post 6 is nested in 4 (triple nesting)
post 8 is nested in 5 (triple nesting)
post 9 is nested in 8 (quadruple nesting)
Therefore I expect the query returns the record in this order:
1
4
6
5
8
9
7
2
But I'm struggling with the query to achieve the above result.
Actually, for single nesting I find a solution, but for deeper nesting.. have really no idea..
I also thought that table schema used is not adequate..
On the other side I thought that such issue can be a common issue, but google didn't gave me any valuable result.. probably used wrong keywords..
Can you please suggest a path to solve this problem, or where to search for?
Thanks!
Jan

Answer 1

the solution is in Eric Weilinau's answer at this Post.
Basically it uses a recurring CTE
I modified a little to use ID value as Order and adding a further filter.
Here is the query:
WITH [NodeList] (
[Id], [ParentId], [Level], [Order]
) AS (
SELECT [Node].[Id]
, [Node].[ParentId]
, 0 AS [Level]
, Right('0000'+CONVERT([varchar](MAX), [Node].[ID]),4) AS [Order]
FROM [Node]
WHERE [Node].[ParentId] = 0
UNION ALL
SELECT [Node].[Id]
, [Node].[ParentId]
, [NodeList].[Level] + 1 AS [Level]
, [NodeList].[Order] + '|'
+ Right('0000' + CONVERT([varchar](MAX), [Node].[ID]),4) AS [Order]
FROM [Node]
INNER JOIN [NodeList] ON [NodeList].[Id] = [Node].[ParentId]
) SELECT [NodeList].[id],
[NodeList].[Level],
REPLICATE('-', [NodeList].[Level] * 4) + [Node].[Name] AS [Name]
FROM [Node]
INNER JOIN [NodeList] ON [NodeList].[Id] = [Node].[Id]
WHERE BlogID=1
ORDER BY [NodeList].[Order]
if somebody can find it helpful.