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Developer-C 11.1
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with com as ( Select 'A' Id, '1' data union all Select 'B' Id, '1' data union all Select 'E' Id, '1' data union all Select 'G' Id, '1' data union all Select 'C' Id, '2' data union all Select 'D' Id, '2' data union all Select 'F' Id, '2' data ) select data,STRING_AGG (Id,',') WITHIN GROUP (ORDER BY data,Id) as Id_All from com group by data
data
Id_All
1
A,B,E,G
2
C,D,F