SQL 服務器圖來獲取連接到一個節點的多個節點類型

Question

我計划在我的一個項目中使用 SQL Server 2019 圖形功能。 數據方案如下圖所示。

給定用戶（ID：2356，名稱：Mark），我想檢索用戶的追隨者完成的所有帖子和推文，這些帖子和推文是在發布時間或推文時排序的，以及對整體結果的限制/分頁.

到目前為止，除了進行 2 個單獨的查詢和手動處理分頁之外，我不知道有更好的方法，如果我們將來除了 Posted/Tweeted 之外添加另一種新的邊緣類型，它會變得低效且麻煩。

在 SQL 服務器圖中是否有更好的方法來解決此類用例？

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

使用異構邊或節點視圖。 請參閱答案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