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)

Answer 2

This seems similar to this question on SO - you might find it useful in answering your question. It is specifically about MySQL not sql server, but anyway, check it out.

---

Edit:

It looks like you may have to simulate group_concat for SQL Server - here's a SO question that discusses that.

Hope that helps some.

---

Edit 2:

But that does make me wonder why you don't just do this on the client app and not via SQL. It seems it would be straightforward enough to accomplish this with the retrieved table that has duplicated int values. Perhaps that might be an approach to take?

Answer 3

This is not exactly +who are you looking for, but there are another way on MSSQL to concatenate values.

    SELECT DISTINCT 
    1 AS TAG,
    NULL AS PARENT,
    EDIFICIOS_ID AS [EDIFICIOS!1!EDIFICIOS_ID],
    NULL AS [EDIFICIOS!1!TITULAR!IDREFS]
FROM 
    @TABLEA
UNION ALL
SELECT DISTINCT  
    1 AS TAG,
    NULL AS PARENT,
    EDIFICIOS_ID AS [EDIFICIOS!1!EDIFICIOS_ID],
    TITULAR+';' AS  [EDIFICIOS!1!TITULAR!IDREFS]
FROM 
    @TABLEA
ORDER BY 
    [EDIFICIOS!1!EDIFICIOS_ID]
FOR XML EXPLICIT