SQL Server获取父级列表 [英] SQL Server get parent list

问题描述

我有一个这样的表:

id name parent_id
1  ab1  3
2  ab2  5
3  ab3  2
4  ab4  null
5  ab5  null
6  ab6  null

我需要使用输入id = 1进行查询(例如)，结果将是这样的:

I need to do a query with input id = 1 (for an example) and results will be like this:

id name parent_id
5  ab5  null
2  ab2  5
3  ab3  2
1  ab1  3

(列出所有级别的所有父母，其ID从1开始)

(List all parents at all level start at item id = 1)

推荐答案

也许是这样的事情?

    WITH parents(id,name,parent,level)
    AS
    (
    SELECT
       ID,
       NAME,
       PARENT,
       0 as level
    FROM
       TABLE
    WHERE ID = 1
    UNION ALL
    SELECT
       ID,
       NAME,
       PARENT,
       Level + 1
    FROM 
       TABLE
    WHERE
       id = (SELECT TOP 1 parent FROM parents order by level desc)
    )
    SELECT * FROM parents

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