返回自引用MSSQL表的父链ID

Question

我想从子记录中获取父链。 不是所有孩子的父母或整个层次结构。

看这里：https://docs.microsoft.com/en-us/sql/t-sql/queries/with-common-table-expression-transact-sql 点“F.使用递归公用表表达式显示层次列表”这是接近我想要做的，但只需要一个单一的亲子关系（ID列表）儿童行。

这里是我的数据：

CREATE TABLE dbo.Stuff 
    (StuffID int PRIMARY KEY NOT NULL, 
    ParentID int NULL, 
    [Name] varchar(25) NOT NULL, 
    [Desc] text NULL) 
GO 

insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (1, null, 'My Home', '1203 WoodHaven Rd') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (2, 1, 'Basement', 'Walkout basement') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (3, 1, 'Level 1', 'Family room') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (4, 1, 'Level 2', 'Living/Kitchen') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (5, 1, 'Level 3', 'Bedrooms & Laundry') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (6, 1, 'Attic', 'attic space') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (7, 2, 'Family Room', 'Family game room') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (8, 2, 'Storeroom', 'Storage room') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (9, 2, 'Furnace', 'Furnace/Server room') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (10, 7, 'Closet', 'Under stairs junk closet') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (11, 9, 'Furnace floor', 'Furnace Room Floor (under desk)') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (12, 9, 'Furnace keyboard Shelf', 'Furnace room name desk shelf') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (13, 9, 'Furnace High Shelf', 'Furnace/Server room high shelf') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (14, 13, 'Router', 'ASUS AC router') 
insert dbo.stuff (StuffID, ParentID, [Name], [Desc]) 
    VALUES (15, 13, 'Deprecated server', 'Old WinServer') 

我想知道在哪里的 '路由器' 是。我期望的结果是：和我可能会通过部分名称搜索它： WHERE [名称] LIKE '％击溃％'

Answer 1

;with parents as 
(
    select 
     StuffID, ParentID 
    from 
     [Stuff] 
    WHERE 
     [Name] LIKE '%rout%' 
    union all 
    select 
     s.StuffID, s.ParentID 
    from 
     [Stuff] s 
    join parents p on 
     s.StuffID = p.ParentID 
) 
SELECT 
    StuffID 
from 
    parents 
order by 
    StuffID 

的输出将是：1 2 7 13 14（与您的期望不同1 2 9 13 14，是一个错误吗？）