如果我正确理解，postid是唯一的，所以这应该有所帮助
编辑：
好，那就试试
DECLARE @BlogPosts TABLE
(
PostID INT PRIMARY KEY not null,
PostTitle NVARCHAR ,
BlogID int,
TotalComments int
)
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 1, 'A', 1, 3
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 2, 'B', 1, 4
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 3, 'C', 2, 5
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 4, 'D', 2, 6
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 5, 'E', 2, 7
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 6, 'F', 1, 8
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 7, 'G', 3, 9
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 8, 'H', 4, 10
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 9, 'I', 5, 11
INSERT INTO @BlogPosts (PostID,PostTitle,BlogID,TotalComments) SELECT 10, 'J', 6, 5
SELECT TOP 5 *
FROM @BlogPosts bp INNER JOIN
(
SELECT BlogID,
MAX(TotalComments) MaxComments
FROM @BlogPosts
GROUP BY BlogID
) maxCommentsPerBlog ON bp.BlogID = maxCommentsPerBlog.BlogID
AND bp.TotalComments = maxCommentsPerBlog.MaxComments
ORDER BY bp.TotalComments DESC
不过，您可能有多个max blog-totalComments组合。
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