SQL图最短路径示例
提供在SQL Server 2019上使用最短路径的示例。这项技术被称为SQL图SQL图最短路径示例,sql,sql-server,sql-graph,Sql,Sql Server,Sql Graph,提供在SQL Server 2019上使用最短路径的示例。这项技术被称为SQL图 Car -> BodyWork | V Wheel -> Tyre 我们如何列出所有部件以及从根目录下来的相关路径 CREATE TABLE PRODUCT ( ProductID int not null identity primary key, ProductName varchar(50) ) AS Node; INSERT INTO PRODUCT(Pro
Car -> BodyWork
|
V
Wheel -> Tyre
我们如何列出所有部件以及从根目录下来的相关路径
CREATE TABLE PRODUCT (
ProductID int not null identity primary key,
ProductName varchar(50)
) AS Node;
INSERT INTO PRODUCT(ProductName) VALUES ('Car'),('BodyWork'),('Wheel'),('Tyre');
SELECT * FROM PRODUCT;
CREATE TABLE HAS_PART AS EDGE;
INSERT INTO HAS_PART ($from_id, $to_id)
VALUES ((SELECT $node_id FROM PRODUCT WHERE ProductId=1), (SELECT $node_id FROM PRODUCT WHERE ProductId=2))
,((SELECT $node_id FROM PRODUCT WHERE ProductId=1), (SELECT $node_id FROM PRODUCT WHERE ProductId=3))
,((SELECT $node_id FROM PRODUCT WHERE ProductId=3), (SELECT $node_id FROM PRODUCT WHERE ProductId=4));
SELECT * FROM HAS_PART;
SELECT
P1.ProductID,
P1.ProductName,
COUNT(P2.ProductName) WITHIN GROUP (GRAPH PATH) AS [Depth],
STRING_AGG(P2.ProductName,'->') WITHIN GROUP (GRAPH PATH) AS [Assembly],
LAST_VALUE(P2.ProductID) WITHIN GROUP (GRAPH PATH) AS [Final Product ID]
FROM
PRODUCT P1,
PRODUCT FOR PATH P2,
HAS_PART FOR PATH HP
WHERE MATCH(SHORTEST_PATH(P1(-(HP)->P2)+))
AND P1.ProductID = 1
ORDER BY P1.ProductID;
你应该把这个问题更多地表述为一个具体的问题。i、 e.给出设置数据,然后询问-如何获得X和Y之间的最短路径?