sql,tsql,recursion,order,hierarchy , T-SQL Ordering a Recursive Query - Parent/Child Structure
T-SQL Ordering a Recursive Query - Parent/Child Structure
I am trying (and failing) to correctly order my recursive CTE. My table consists of a parent-child structure where one task can relate to another on a variety of different levels.
For example I could create a task (this is the parent), then create a sub-task from this and then a sub-task from that sub-task and so forth..
Below is some test data that I have included. Currently it's ordered by
Path which orders it alphabetically.
So if I were to create a task. It would give me a TaskID for that task (Say 50) - I could then create 5 subtasks for that main task (51,52,53,54,55). I could then add sub-tasks to the 5 subtasks (51->56) (53->57) but when I want the order I would need it returning
So the order I would require it
Proper order of the test data
Here is the code that I have been using
DECLARE @TaskID NUMERIC(10,0)
SET @TaskID = 38
;WITH cte AS
,CONVERT(VARCHAR(MAX),'') AS [Nest]
,CONVERT(VARCHAR(MAX),'') AS [Path]
t.ParentID IS NULL
AND t.TaskID = @TaskID
,cte.[Nest] + CONVERT(VARCHAR(MAX),sub.TaskID) AS [Nest]
,cte.[Path] + ',' + CONVERT(VARCHAR(MAX),sub.TaskID) AS [Path]
INNER JOIN cte ON cte.TaskID = sub.ParentID
,NULLIF(LEN(cte.[Path]) - LEN(REPLACE(cte.[Path], ',', '')),0) Nest
,CONVERT(VARCHAR(25),@TaskID) + cte.[Path] AS [Path]
I have a feeling it will be blindingly obvious but I'm really not sure how to proceed. I thought about more recursion, functions, splitting the string with no success.
Apologies if I'm not being clear
The easiest way would be to pad the keys to a fixed length. e.g.
038,007 will be ordered before
038,012 But the padding length would have to be safe for the largest taskid. Although you could keep your
path trimmed for readability and create an extra padded field for sorting.
A somewhat safer version would be to do the same, but create a padded path from row_numbers. Where the padding size would have to be big enough to support the maximum number of sub items.
DECLARE @TaskID NUMERIC(10,0)
SET @TaskID = 38
declare @maxsubchars int = 3 --not more than 999 sub items
;with cte as
,0 AS [Nest]
,CONVERT(VARCHAR(MAX),t.taskid) AS [Path]
t.ParentID IS NULL
AND t.TaskID = @TaskID
,cte.Nest + 1
,cte.[Path] + ',' + CONVERT(VARCHAR(MAX),sub.TaskID)
,cte.OrderPath + ',' + right(REPLICATE('0', @maxsubchars) + CONVERT(VARCHAR,ROW_NUMBER() over (order by sub.TaskID)), @maxsubchars)
INNER JOIN cte ON cte.TaskID = sub.ParentID
select taskid, parentid, title,nullif(nest,0) Nest,Path, createddate from cte order by OrderPath
You could probably go more fancy than a fixed subitem length, determining the amount of subitems and basing the padding on said length. Or using numbered rows based on the amount of siblings and traverse in reverse direction and maybe (just spouting some untested thoughts), but using a simple ordered path is likely enough.
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