tente isso:
DECLARE @TableA table (RowID int, Value1 varchar(5), Value2 varchar(5))
DECLARE @TableB table (RowID int, TypeOf varchar(10))
INSERT INTO @TableA VALUES (1,'aaaaa','A')
INSERT INTO @TableA VALUES (2,'bbbbb','B')
INSERT INTO @TableA VALUES (3,'ccccc','C')
INSERT INTO @TableB VALUES (1,'wood')
INSERT INTO @TableB VALUES (2,'wood')
INSERT INTO @TableB VALUES (2,'steel')
INSERT INTO @TableB VALUES (2,'rock')
INSERT INTO @TableB VALUES (3,'plastic')
INSERT INTO @TableB VALUES (3,'paper')
;WITH Combined AS
(
SELECT
a.RowID,a.Value1,a.Value2,b.TypeOf
FROM @TableA a
LEFT OUTER JOIN @TableB b ON a.RowID=b.RowID
)
SELECT
a.*,dt.CombinedValue
FROM @TableA a
LEFT OUTER JOIN (SELECT
c1.RowID
,STUFF(
(SELECT
', ' + TypeOf
FROM Combined c2
WHERE c2.rowid=c1.rowid
ORDER BY c1.RowID, TypeOf
FOR XML PATH('')
)
,1,2, ''
) AS CombinedValue
FROM Combined c1
GROUP BY RowID
) dt ON a.RowID=dt.RowID
RESULTADO:
RowID Value1 Value2 CombinedValue
----------- ------ ------ ------------------
1 aaaaa A wood
2 bbbbb B rock, steel, wood
3 ccccc C paper, plastic
