[英]SQL 2008 stored proc returns nothing if CROSS APPLY is nothing. How can I fix?
下面存储的proc返回来自许多相关表的数据,并且对票表进行了叉号运算。 此交叉应用返回与特定articleid关联的trueid列中所有真实值的平均值,而relevanceid列则相同。 这非常有效,除了尚未为特定商品ID投任何票时。 在这种情况下,存储的过程根本不返回任何内容。 鉴于我不想在投票表中捏造记录,有人能想到解决此问题的好方法吗?
(@ArticleID int)
AS
BEGIN
WITH Article AS
(
SELECT
tbrm_Article.ArticleID,
tbrm_Article.CountryID,
tbrm_Article.CategoryID,
tbrm_Article.Title,
tbrm_Article.ArticleDetail,
tbrm_Article.Source,
tbrm_Article.ArticleDateTimeAdded,
tbrm_Article.UserId,
tbrm_Article.ViewCount,
tbrm_Article.CommentCount,
tbrm_CountryList.CountryName AS CountryName,
tbrm_CategoryList.CategoryName AS CategoryName,
aspnet_Users.UserName AS UserName,
Truthfulness,
Relevance
FROM
tbrm_Article INNER JOIN
tbrm_CountryList ON tbrm_Article.CountryID = tbrm_CountryList.CountryID INNER JOIN
tbrm_CategoryList ON tbrm_Article.CategoryID = tbrm_CategoryList.CategoryID INNER JOIN
aspnet_Users ON tbrm_Article.UserID = aspnet_Users.UserID
CROSS APPLY (
SELECT tbrm_Votes.ArticleID, AVG(tbrm_Votes.TruthID), AVG(tbrm_Votes.RelevanceID)
FROM tbrm_Votes
WHERE tbrm_Article.ArticleID = tbrm_Votes.ArticleID
GROUP BY tbrm_Votes.ArticleID
) AS Votes(ArticleID,Truthfulness,Relevance)
WHERE
tbrm_Article.ArticleID = @ArticleID)
SELECT * FROM Article
END
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