Sql server 电子邮件表-合并到一个主题行并将其分组

这是一个电子邮件表，我试图压缩行，如下面的所需格式：。有没有一种简单的方法可以将收件人/组折叠到同一主题行中

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更多信息：不需要

Group=-1

和

To=0

根据您的示例数据，我们可以使用XML path（）获得这些字段

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@你发帖子的时候我在睡觉

Given:
subject, To, Group
----------------------
subject1, name1, -1
subject2, name1, -1
subject2, name2, -1
subject2, 0, group1


Desired format:
Subject, To
-----------------
subject1, name1
subject2, name1, name2, group1

declare @t table(subject varchar(10),too varchar(10),groups varchar(10))
insert into @t (subject,too,groups)values
 ('subject1', 'name1', '-1'),
('subject2', 'name1', '-1'),
('subject2', 'name2', '-1'),
('subject2', '0', 'group1')

;with CTE AS (
select subject,STUFF((select distinct +','+too from @t 
    where subject = t.subject 
        for xml path('')),1,1,'')+
STUFF((select distinct +','+groups from @t
     where subject = t.subject 
        for xml path('')),1,1,'')R from @t t
GROUP BY subject )
select subject,
CASE WHEN CHARINDEX(',',R) > 0 
    THEN REPLACE(SUBSTRING(R, CHARINDEX(',', R) + 1, 20),'-1','')
         ELSE replace(R,'-1','') END [To] from CTE