SQL 服务器图来获取连接到一个节点的多个节点类型

Question

I'm planning to use SQL Server 2019 graph features for one of my project. The data scheme would look something like the picture below.

Given the user (Id: 2356, name: Mark), I would want to retrieve all the Posts and the Tweets done by the user's follower ordered by when it was posted or when it was tweeted together with a limit/pagination on the overall result.

As of now, I don't know of a better way other than doing 2 separate queries & manually handling pagination, which makes it inefficient & also cumbersome if we add another new edge type in future in addition to Posted/Tweeted.

Are there better ways to address such usecases in SQL Server graph?

SELECT mainUser.*, followingUser.*, followerPost.*
FROM 
     User mainUser, Follows userFollows, User followingUser, Posted followerPosted, Post followerPost 
WHERE 
     MATCH (mainUser-(userFollows)->followingUser-(followerPosted)->followerPost)
AND
     mainUser.id=2356
ORDER BY
     followerPosted.posted_on desc

SELECT mainUser.*, followingUser.*, followerTweet.*
FROM 
     User mainUser, Follows userFollows, User followingUser, Tweeted tweeted, Tweet followerTweet 
WHERE 
     MATCH (mainUser-(userFollows)->followingUser-(tweeted)->followerTweet)
AND
     mainUser.id=2356
ORDER BY
     tweeted.tweeted_on desc

Answer 1

Use heterogenous edge or node view. See answer https://stackoverflow.com/a/70055567/3434168 .

---- there may be column colisions due to UNION ALL so fix them as you need
---- it doesn't matter which columns you select in your view
---- the MATCH algorithm (probably) uses metadata of the VIEW
CREATE VIEW v_SecondTierEdges AS
  SELECT *, 'Tweeted' AS Type FROM Tweeted
  UNION ALL
  SELECT *, 'Posted' AS Type FROM Posted
GO

CREATE VIEW v_SecondTierNodes AS
  SELECT tweeted_on AS did_that_on, 'Tweet' AS Type FROM Tweet
  UNION ALL
  SELECT posted_on AS did_that_on, 'Post' AS Type FROM Post
GO

SELECT
  mainUser.*, followingUser.*, followerTweet_or_Post.*
FROM 
  User mainUser, Follows userFollows, User followingUser, v_SecondTierEdges tweeted_or_posted, v_SecondTierNodes followerTweet_or_Post 
WHERE 
  MATCH (mainUser-(userFollows)->followingUser-(tweeted_or_posted)->followerTweet_or_Post)
AND
  mainUser.id=2356
ORDER BY
  tweeted_or_posted.did_that_on desc