用SQL 查询每一组里notext的多行记录只保留一次，如何判断和去重复，请专家解答。

已知条件 表t里有多行记录，同一个GroupID简称一个组，每一组的多行数字和其他其他一组里的数字是重复的就保留一次。
问题：如何用SQL判断不同的一组里每一行notext数字都是和其他一组里的notext数字是重复的,去重复后保留一次，请专家解答。

 ;with t(ID,GroupID,NoText) as(
select '1','1','1 2 3'
union all select '2','1','4 5 6'
union all select '3','1','7 8 9'
union all select '4','2','1 2 3'
union all select '5','2','4 5 6'
union all select '6','2','7 8 9'
union all select '7','3','2 3 4'
union all select '8','3','4 5 6'
union all select '9','3','7 8 9'
union all select '10','4','2 3 4'
union all select '11','4','4 5 6'
union all select '12','4','7 8 9'
union all select '13','5','1 2 3'
union all select '14','5','4 5 6'
union all select '15','5','6 7 8')
select ID,GroupID,NoText from t
WHERE ID in
(select min(id) from t group by notext)
order by GroupID

题主的代码执行的结果是错误的，实际上想要的结果
---------------------------
ID    GroupID    NoText
1    1    1 2 3
2    1    4 5 6
3    1    7 8 9
7    3    2 3 4
8    3    4 5 6
9    3    7 8 9
13    5    1 2 3
14    5    4 5 6
15    5    6 7 8

DROP TABLE IF EXISTS #t
SELECT *, cast ('' AS NVARCHAR(200)) AS AllText  INTO #t FROM(
SELECT '1' ID,'1' GroupID,'1 2 3' NoText
union all select '2','1','4 5 6'
union all select '3','1','7 8 9'
union all select '4','2','1 2 3'
union all select '5','2','4 5 6'
union all select '6','2','7 8 9'
union all select '7','3','2 3 4'
union all select '8','3','4 5 6'
union all select '9','3','7 8 9'
union all select '10','4','2 3 4'
union all select '11','4','4 5 6'
union all select '12','4','7 8 9'
union all select '13','5','1 2 3'
union all select '14','5','4 5 6'
union all select '15','5','6 7 8'
) t
DECLARE @allText NVARCHAR(max)='',@GroupID VARCHAR(10)='0'
update #t SET @allText=CASE WHEN @GroupID=GroupID THEN @allText+NoText ELSE NoText END,@GroupID=GroupID,AllText=@allText

SELECT  ID, GroupID, NoText
FROM    #t
WHERE   GroupID IN ( SELECT MIN(GroupID)FROM #t WHERE   LEN(AllText) = 15 GROUP BY  AllText );

如果组2是456,123,789 ,查询结果会有组2么

可以用listagg函数处理一下，但是有个缺陷，这个函数是根据查询结果排序的，所以要根据大小先进行排序：
delete from t where groupid in(
select max(groupid) from (select groupid,listagg(notext) mm from (select * from t order by groupid,NoText) group by groupid) m
group by m.mm having count(1)>1);
或者用排序开窗一个一个比较。。
比如rn=1的notext and rn=2的notext and rn=3的notext同时满足