Row concat from this query

Question

I have this query:

SELECT DISTINCT IM.EDIFICIOS_ID, TI.TITULAR
FROM IMPORTACION IM
INNER JOIN I_EDIFICIO IE ON IM.IMPORTACION_ID=IE.IMPORTACION_ID
INNER JOIN I_EDIFICIO_TITULAR ET ON IM.IMPORTACION_ID=ET.IMPORTACION_ID AND IE.EDIFICIO_ID=ET.EDIFICIO_ID
INNER JOIN I_TITULAR TI ON IM.IMPORTACION_ID=TI.IMPORTACION_ID AND ET.TITULAR_ID=TI.TITULAR_ID
WHERE TI.TITULAR IS NOT NULL AND TI.TITULAR<>''
ORDER BY IM.EDIFICIOS_ID, TI.TITULAR;

that returns this result set:

EDIFICIOS_ID TITULAR
------------ ------------------
1911         Ana María García
1911         Anselmo Piedrahita
1911         Manuel López
2594         Carlos Pérez
2594         Felisa García
6865         Carlos Pérez
6865         Felisa García
8428         Carlos Pérez

I want to concatenate the values from TITULAR for each EDIFICIOS_ID, so I get this:

EDIFICIOS_ID TITULAR
------------ ------------------
1911         Ana María García; Anselmo Piedrahita; Manuel López
2594         Carlos Pérez; Felisa García
6865         Carlos Pérez; Felisa García
8428         Carlos Pérez

I'm trying to use the FOR XML PATH trick. I've used it in the past but, since I can't really understand how it works, I can't figure out how to apply it to this specific case. Can you provide me with some ideas?

Answer 1

try something like this:

DECLARE @TableA  table (EDIFICIOS_ID int, TITULAR nvarchar(500))
INSERT INTO @TableA VALUES (1911 ,'Ana María García')
INSERT INTO @TableA VALUES (1911 ,'Anselmo Piedrahita')
INSERT INTO @TableA VALUES (1911 ,'Manuel López')
INSERT INTO @TableA VALUES (2594 ,'Carlos Pérez')
INSERT INTO @TableA VALUES (2594 ,'Felisa García')
INSERT INTO @TableA VALUES (6865 ,'Carlos Pérez')
INSERT INTO @TableA VALUES (6865 ,'Felisa García')
INSERT INTO @TableA VALUES (8428 ,'Carlos Pérez')

;with ResutSet AS
(
    SELECT EDIFICIOS_ID,TITULAR FROM @TableA
    --replace with your query here and don't use @TableA
    --  SELECT DISTINCT IM.EDIFICIOS_ID, TI.TITULAR
    --  FROM IMPORTACION IM
    --  INNER JOIN I_EDIFICIO IE ON IM.IMPORTACION_ID=IE.IMPORTACION_ID
    --  INNER JOIN I_EDIFICIO_TITULAR ET ON IM.IMPORTACION_ID=ET.IMPORTACION_ID AND IE.EDIFICIO_ID=ET.EDIFICIO_ID
    --  INNER JOIN I_TITULAR TI ON IM.IMPORTACION_ID=TI.IMPORTACION_ID AND ET.TITULAR_ID=TI.TITULAR_ID
    --  WHERE TI.TITULAR IS NOT NULL AND TI.TITULAR<>''
    --  ORDER BY IM.EDIFICIOS_ID, TI.TITULAR;
)
SELECT
    c1.EDIFICIOS_ID
        ,STUFF(
                 (SELECT
                      '; ' + TITULAR
                      FROM ResutSet  c2
                      WHERE c2.EDIFICIOS_ID=c1.EDIFICIOS_ID
                      ORDER BY c1.EDIFICIOS_ID, TITULAR
                      FOR XML PATH('') 
                 )
                 ,1,2, ''
              ) AS CombinedValue
    FROM ResutSet c1
    GROUP BY c1.EDIFICIOS_ID
    ORDER BY c1.EDIFICIOS_ID

OUTPUT:

EDIFICIOS_ID CombinedValue
------------ ---------------------------------------------------
1911         Ana María García; Anselmo Piedrahita; Manuel López
2594         Carlos Pérez; Felisa García
6865         Carlos Pérez; Felisa García
8428         Carlos Pérez

(4 row(s) affected)