How to build query to get tree architecture of self referencing table
Dear all,
I have the following table design :
This is a self referencing table representing a set of SubCategories which can have parent sub categories or not. I did not show here the Category table.
If the Subcategory has the ParentSubCategory ID = null, then this is a root subcategory otherwise it is a child of a parent sub category.
What I am looking for is the easy way to display the structure level by ProductCategoryID ?
Thanks for helps
you can use a recursive logic based on CTE for that
something like this would be enough
;WITH ProdSubCat_Hiererchy
AS
SELECT psc.ProductSubCategoryID,c.CategoryName,psc.ParentSubCategoryID, psc.Name,CAST(psc.Name AS varchar(max)) AS [Path],1 AS [level]
FROM ProductSubCategory psc
INNER JOIN Category c
ON c.CategoryID = psc.ProductCategoryID
WHERE psc.ParentSubCategoryID IS NULL
UNION ALL
SELECT psc.ProductSubCategoryID,c.CategoryName,psc.ParentSubCategoryID, psc.Name,CAST(psch.[Path] + '/' + psc.Name AS varchar(max)) AS [Path],psch.[level] + 1
FROM ProductSubCategory psc
INNER JOIN Category c
ON c.CategoryID = psc.ProductCategoryID
INNER JOIN ProdSubCat_Hiererchy psch
ON psch.ProductSubCategoryID = psc.ParentSubCategoryID
SELECT *
FROM ProdSubCat_Hiererchy
ORDER BY LEFT([Path],CHARINDEX('/',[Path]+'/')-1),[Level]
OPTION (MAXRECURSION 0)
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs
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3 (
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13 select 10 id, 'aaaa bbbbz#$' name from dual union all
14 select 11 id, 'cccc dddd-/mnm' name from dual
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3 a@3$%jkhkjn
5 bbvxzckvbzxcv&^%#
7 sdsaf$([]:'
8 <-fdsjgbdfsg
10 aaaa bbbbz#$
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2 as
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19 (
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22 , '.'
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Edited by: jarola on Jan 21, 2011 10:38 PM
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