I toto splní účel
Ukázková data
declare @t table(id int, name varchar(20),somecolumn varchar(MAX))
insert into @t
select 1,'ABC','X' union all
select 1,'ABC','Y' union all
select 1,'ABC','Z' union all
select 2,'MNO','R' union all
select 2,'MNO','S'
Dotaz:
SELECT ID,Name,
STUFF((SELECT ',' + CAST(T2.SomeColumn AS VARCHAR(MAX))
FROM @T T2 WHERE T1.id = T2.id AND T1.name = T2.name
FOR XML PATH('')),1,1,'') SOMECOLUMN
FROM @T T1
GROUP BY id,Name
Výstup:
ID Name SomeColumn
1 ABC X,Y,Z
2 MNO R,S