在SQL查询中将多行选择为一个变量

此查询提供错误： 子查询返回了多个值。当子查询在=、！=、=或者当子查询用作表达式时

如何重写此查询以使其工作，从而将所有值都包含在一个变量中？最终结果需要是一个如下所示的“视图”：

.ObjectID int

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

.域字符串

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.SiteID int

您需要的是一个字符串concat聚合函数，sql server Unfortunualey不包括该函数

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您可以使用.Net CLr函数创建自己的。请参见和

根据Martin的评论：

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

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您可以这样分配给局部变量

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 the Fish!')

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

我用过一些东西：

SELECT @TempVariable = (SELECT replytext + ' ' FROM @t FOR XML PATH(''))

结果:

SELECT
MyTable.Number AS Number,
(SELECT stuff(
    (
    select ', ' + x from (SELECT MyOtherTable.Name AS x FROM MyOtherTable WHERE MyOtherTable.ID = MyTable.ID) tb 
    FOR XML PATH('')
    )
, 1, 2, ''))AS AllNames

FROM
MyTable

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这正是我不想要的。我需要所有记录集并将它们连接成一个值您可以在SQL Server中使用

XML路径将多行中的值连接成一个字符串这对我有用me@t是DECLARE@t表（id int，ReplyText varchar（100））
Number:   AllNames:
  1       Andrew, Carl
  2       Bobby, Dave