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GO
CREATE FUNCTION dbo.fn_Sum(@code varchar(50))
RETURNS varchar(8000)
AS
BEGIN
DECLARE @values varchar(8000)
SET @values = ''
SELECT @values = @values + ',' + values from test WHERE code=@code
RETURN STUFF(@values, 1, 1, '')
END
GO



DROP FUNCTION dbo.fn_Sum

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SQL code:
Insert into table(code,data)
SELECT code, data = dbo.fn_Sum(code)
from test
GROUP BY code

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