在SQL Query中将多个行选择为一个变量

Question

SELECT ft.ThreadTitle AS Title, 
fr.ReplyText + ' ' + ua2.Username + ' ' + ft.ThreadText + ' '  +

-- THIS NEXT LINE IS WHAT I WANT TO ACHIEVE:

(Select ReplyText from ForumReply Where ThreadID=ft.ThreadID) 

-- THE ABOVE LINE HAVE MULTIPLE ROWS/VALUES THAT I WANT TO JOIN INTO ONE VARIABLE. HOW?
AS [Content], 

ss.Domain, 
ss.SiteID, 
ft.ThreadID AS ObjectId
FROM         dbo.ForumReply AS fr INNER JOIN
                      dbo.ForumThreads AS ft ON fr.ThreadID = ft.ThreadID INNER JOIN
                      dbo.User_Account AS ua1 ON ft.CreateByUserID = ua1.UserID INNER JOIN
                      dbo.User_Account AS ua2 ON fr.ReplyUserID = ua2.UserID INNER JOIN
                      dbo.SysT_Site AS ss ON ua1.SiteID = ss.SiteID

此查询给出错误: 子查询返回的值超过1.当子查询跟随=,!=,<,<=,>,> =或子查询用作表达式时,不允许这样做.

如何重写此查询以使我将所有值都放入一个变量中？最终结果必须是"View",如下所示:

.ObjectID int

.Content(包含Forumthread.threadText和forumReply.ReplyText中存在的所有文本的字符串)

.Domain字符串

.SiteID int

Answer 1

以马丁的评论为基础:

DECLARE @t TABLE  (id int, ReplyText varchar(100))
INSERT INTO @t (id, ReplyText) VALUES (1, 'So Long,')
INSERT INTO @t (id, ReplyText) VALUES  (2, 'And Thanks for')
INSERT INTO @t (id, ReplyText) VALUES  (3, 'All of the Fish!')

SELECT (SELECT replytext + ' '  FROM @t FOR XML PATH('')) AS CONTENT