图形最短路径只使用带标签的边？

azpvetkf 于 2021-08-13 发布在 Java

关注(0)|答案(1)|浏览(343)

对于新的sql server版本，有以下功能 SHORTEST_PATH . 我使用边表中的属性（或标签）来区分不同类型的连接。
不幸的是 SHORTEST_PATH 函数似乎不允许where条件中的任何属性（如果表被标记为path）

SELECT
       l1.CommonName AS CommonName, 
       STRING_AGG(l2.CommonName, '->') WITHIN GROUP (GRAPH PATH) AS Verbindung,
       LAST_VALUE(l2.CommonName) WITHIN GROUP (GRAPH PATH) AS LastNode
 from           object as l1, 
                connections for path as v,
                object for path as  l2 
    where match(SHORTEST_PATH( l1  (-(v)-> l2)+))
    and l1.CommonName = 'jagdtWurst'
    and v.label= 'hierarchie' <<--- This is not possible .... Error

有没有什么诀窍怎么做呢？

sql sql-server tsql sql-server-2019 graph-algorithm

来源：https://stackoverflow.com/questions/62094261/graph-shortest-path-use-only-labelled-edges

1条答案

按热度按时间

von4xj4u1#

看起来可以在中使用子查询 from 条款。如

SELECT
       l1.CommonName AS CommonName, 
       STRING_AGG(l2.CommonName, '->') WITHIN GROUP (GRAPH PATH) AS Verbindung,
       LAST_VALUE(l2.CommonName) WITHIN GROUP (GRAPH PATH) AS LastNode
 from           object as l1, 
                (select * from connections where label = 'hierarchie') for path as v,
                object for path as  l2 
    where match(SHORTEST_PATH( l1  (-(v)-> l2)+))
    and l1.CommonName = 'jagdtWurst'

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图形最短路径只使用带标签的边？

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