使用HierarchyID選擇SQL Server中的父級和子級

Question

我有HierarchyID表，並希望在子級屬性上選擇父級和子級。

這裏的表：

CREATE TABLE #BOMTbl 
(
    ItemNo HIERARCHYID NOT NULL, 
    Lvl AS ItemNo.GetLevel() PERSISTED, 
    MatID VARCHAR(25) NULL, 
    CONSTRAINT PK_#BOMTbl PRIMARY KEY NONCLUSTERED(ItemNo) 
); 

insert into #BOMTbl (ItemNo,MatID) values 
('/1/',''), 
('/1/1/',''), 
('/1/1/1/','MA-A'), 
('/1/1/2/','MA-A'), 
('/1/1/3/','MA-B'), 
('/1/2/',''), 
('/1/2/1/','MA-B'), 
('/1/2/2/','MA-B'), 
('/1/3/',''), 
('/1/3/1/','PW-A'), 
('/1/3/2/','PW-A'), 
('/1/4/',''), 
('/1/4/1/','PW-B'), 
('/1/4/2/','PW-B'), 
('/1/5/','0001'), 
('/1/6/','0001'), 
('/1/7/','0002'), 
('/1/8/','0003') 

我想這樣的結果來選擇表：

ItemNo ItemID Lvl MatID 
0x5AC0 /1/1/ 2 
0x5AD6 /1/1/1/ 3 MA-A 
0x5ADA /1/1/2/ 3 MA-A 
0x5B40 /1/2/ 2 
0x5ADE /1/1/3/ 3 MA-B 
0x5B56 /1/2/1/ 3 MA-B 
0x5B5A /1/2/2/ 3 MA-B 

Answer 1

select ItemNo, ItemNo.ToString() AS ItemID, Lvl, MatID from BOMTbl p 
WHERE exists 
(select * from BOMTbl c 
where c.MatID like 'MA%' 
and (c.ItemNo.GetAncestor(1) = p.ItemNo 
     or c.ItemNo.GetAncestor(0) = p.ItemNo)) 

SQLFiddle

Answer 2

將下面的查詢幫助嗎？

select ItemNo, ItemNo.ToString() AS ItemID, Lvl, MatID from #BOMTbl 
WHERE ItemNo.IsDescendantOf('/1/1/') = 1 
UNION 
select ItemNo, ItemNo.ToString() AS ItemID, Lvl, MatID from #BOMTbl 
WHERE ItemNo.IsDescendantOf('/1/2/') = 1 

Answer 3

我想出了：

with cte as (
    select * 
    from #BOMTbl 
    where MatId like 'MA%' 
) 
select * 
from cte as child 
union 
select parent.* 
from cte as child 
join #BOMTbl as parent 
    on child.ItemNo.GetAncestor(1) = parent.ItemNo