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Code
DECLARE @Table TABLE(id int, value varchar(10))
INSERT @Table SELECT 1, 'AA'
UNION ALL SELECT 1, 'BB'
UNION ALL SELECT 2, 'AAA'
UNION ALL SELECT 2, 'BBB'
UNION ALL SELECT 2, 'CCC'
UNION ALL SELECT 3, 'AAAA'
UNION ALL SELECT 3, 'BBBB'
UNION ALL SELECT 3, 'XXXX'SELECT * FROM(
SELECT DISTINCT
id
FROM @Table
) A
OUTER APPLY(
SELECT
[values]= STUFF(REPLACE(REPLACE(
(
SELECT value FROM @Table N
WHERE id = A.id
FOR XML AUTO
), '<N value="', ','), '"/>', ''), 1, 1, '')
) N
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