How to get all child of a given id in SQL Server query -

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i have 2 tables in sql server database:

category(     itemid,     parentid )  articleassignedcategories(    categid,     artid )

categid foreign key of itemid

i want count of artids , child of given itemid (child means categories parentid of given itemid.)

for example; if given itemid = 1 , in table category have (3,1),(4,1)(5,3)

all of 3, 4, 5 child of 1

can me write query?

recursive queries can done using cte

with cte(itemid, parentid) (   -- start category   select itemid, parentid   category itemid = <some_itemid> union    -- recursively add children   select c.itemid, c.parentid   category c    join cte on c.parentid = cte.itemid ) select count(*) articleassignedcategories join cte on cte.itemid = a.categid

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