停留在SQL查询上以计算行数

如何解决停留在SQL查询上以计算行数

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SELECT 
  COUNT(*) AS TotalUserVotes
FROM tblArticleVotes AS v 
INNER JOIN tblArticles AS a 
  ON v.ArticleID = a.ID 
     AND a.AuthorID = 13405

它总是返回0。我有一个表

tblArticles

，其中有

AuthorID

和

ID

（文章的主键）。 然后，我有一个带有ѭ4with列的文章投票表。 给定用户

13405

，我需要找出他们所有文章的投票数！ 只是为了确认，ѭ6中当前有一条记录，其商品ID为ѭ7。文章ID 5的作者ID为13405。     

解决方法

        嗯... JOIN中的AuthorID看起来很奇怪...也许效果更好？

SELECT COUNT(*) AS TotalUserVotes
  FROM tblArticleVotes AS v INNER JOIN
  tblArticles AS a ON v.ArticleID = a.ID
  WHERE a.AuthorID = 13405

    ,        尝试将\“ AND \”更改为\“ WHERE \”：

SELECT COUNT(*) AS TotalUserVotes
FROM tblArticleVotes AS v INNER JOIN
tblArticles AS a ON v.ArticleID = a.ID WHERE a.AuthorID = 13405

高温超导     ,        您的查询没有错。要排除故障，请中断查询。

DECLARE @ArticleID int
SELECT @ArticleID = a.ID FROM tblArticles a WHERE a.AuthorID=13405

PRINT @ArticleID
SELECT * FROM tblArticleVotes where ArticleID=@ArticleID

    ,        试试这个代替：

SELECT a.AuthorID,COUNT(v.id) as votes
FROM tblArticles AS a 
LEFT JOIN tblArticleVotes AS v ON a.ID = v.ArticleID
GROUP BY a.ID
WHERE a.AuthorID = :author_id