当我运行下面的SQL 08查询时,我得到一个错误,即tbrm_Article.ArticleID无效,因为它不包含在聚合函数或GROUP BY子句中。
我知道问题与以下方面有关: AVG(tbrm_Votes.True)AS真相, AVG(tbrm_Votes.False)AS False, 以及后续加入tbrm_Votes表。
tbrm_votes表包含文章ID,真数列,假数列。我试图平均给定文章ID的所有真假数字。文章ID可以在投票表中多次出现。
SELECT * FROM
(
SELECT
tbrm_Article.ArticleID,
tbrm_Article.CountryID,
tbrm_Article.CategoryID,
tbrm_Article.Title,
tbrm_Article.ArticleDetail,
tbrm_Article.Source,
tbrm_Article.ArticleDateTimeAdded,
tbrm_Article.ViewCount,
tbrm_Article.CommentCount,
tbrm_CountryList.CountryName AS CountryName,
tbrm_CountryList.CountryImage AS CountryImage,
tbrm_CategoryList.CategoryName AS CategoryName,
tbrm_CategoryList.CategoryImage AS CategoryImage,
aspnet_Users.UserName AS UserName,
AVG(tbrm_Votes.True) AS Truth,
AVG(tbrm_Votes.False) AS False,
ROW_NUMBER() OVER (ORDER BY tbrm_Article.ArticleDateTimeAdded DESC) AS RowRank
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 INNER JOIN
tbrm_Votes ON tbrm_Article.ArticleID = tbrm_Votes.ArticleID
) Article
WHERE Article.RowRank > @PageIndex AND RowRank <= (@PageIndex + @PageSize)
ORDER BY Article.ArticleDateTimeAdded DESC
如果有人能告诉我哪里出错了,我会很感激。感谢
答案 0 :(得分:3)
如果您有平均或其他聚合函数,则需要说出其他字段的组合方式。
即计算平均值的行数。
这是由group by命令完成的。这表示取这些字段并对这些字段中具有相同值的行进行汇总。 (Sybase文档说'group by通常与聚合一起使用,以指定如何对选择查询的未聚合列进行分组。')
因此,我们需要
group by
tbrm_Article.ArticleID,
tbrm_Article.CountryID,
tbrm_Article.CategoryID,
tbrm_Article.Title,
tbrm_Article.ArticleDetail,
tbrm_Article.Source,
tbrm_Article.ArticleDateTimeAdded,
tbrm_Article.ViewCount,
tbrm_Article.CommentCount,
tbrm_CountryList.CountryName
tbrm_CountryList.CountryImage
tbrm_CategoryList.CategoryName
tbrm_CategoryList.CategoryImage
aspnet_Users.UserName AS UserName
答案 1 :(得分:0)
使用分析替换聚合:
AVG(tbrm_Votes.True) OVER() AS Truth
AVG(tbrm_Votes.False) OVER() AS False