1, 2005 before the database, use the function to achieve. (Find parent node according to child nodes)
object_id IF ( 'f_getParentBySon') IS Not null drop function f_getParentBySon
the GO
the CREATE function f_getParentBySon (@id VARCHAR (100))
the RETURNS @t Table (ID VARCHAR (100))
AS
the begin
INSERT INTO @t @id SELECT
SELECT @ ID = Parid from BOM_Detail where id = @id and Parid is not null - the first performance, the data input id = id where all find out, and then the parent id assigned to the variable (when the purpose is the same sub-id involved in more than one parent find out all the parent product) when constructing the goods
the while @@ ROWCOUNT> 0
the begin
INSERT INTO @t the SELECT @id the SELECT @id = Parid from the above mentioned id = BOM_Detail the WHERE iS @id and Parid not null - check out the merchandise has been father the new data assignment variables, and once again the father of a new product to the variable data query, data query out of the loop until no
End
return
End
Go
使用：select a.* from BOM_Detail a , f_getParentBySon('000020000600005') b where a.id= b.id
2, 2005 after the database, with as aid statement (based on purpose is still to find a child node parent node)
;WITH subqry AS
(
SELECT tb.id, tb.qty, tb.parid FROM tb WHERE id=@id
UNION ALL
SELECT tb.id, tb.qty, tb.parid FROM tb,subqry
WHERE tb.id= subqry.Parid
)
select * from subqry - query data
For examples with as demo, with the help of God's great article https://www.cnblogs.com/hshuai/p/3947424.html