Most of the time we have one master table and one child table which content reference of master table. We have to fetch all the child column as comma separated for master table column. for example I have a product category table and product table. We want all the product as a comma separated in one column corresponding to each category.
lets understand this by an example. I am taking Adventureworks2012 database in the example. below is default view
Now after processing we want below result
Now to achieve this we will write following command
DECLARE @CategoryProducts AS TABLE (ProductCategoryId INT,
INSERT INTO @CategoryProducts(ProductCategoryId,Category )
FROM Production.ProductCategory pc
SET Products = (SELECT p.Name + ','
FROM Production.Product p
WHERE p.ProductSubcategoryID = tmp.ProductCategoryId
ORDER BY p.Name
FOR XML PATH (''))
FROM @CategoryProducts tmp
SELECT * FROM @CategoryProducts WHERE Products IS NOT NULL
So using XML path it easy to get what we want.
I hope this may help you somewhere