Sql PIVOT and string concatenation aggregate

In order to get the result, first you should concatenate the values into the comma separated list.

I would use CROSS APPLY and FOR XML PATH:

SELECT distinct e.[Event Name],
  e.[Resource Type],
  LEFT(r.ResourceName , LEN(r.ResourceName)-1) ResourceName
FROM yourtable e
CROSS APPLY
(
    SELECT r.[Resource Name] + ', '
    FROM yourtable r
    where e.[Event Name] = r.[Event Name]
      and e.[Resource Type] = r.[Resource Type]
    FOR XML PATH('')
) r (ResourceName)

See SQL Fiddle with Demo. The gives you result:

| EVENT NAME |   RESOURCE TYPE |                          RESOURCENAME |
------------------------------------------------------------------------
|    Event 1 | Resource Type 1 |                Resource 1, Resource 2 |
|    Event 1 | Resource Type 2 |                Resource 3, Resource 4 |
|    Event 1 | Resource Type 3 |    Resource 5, Resource 6, Resource 7 |
|    Event 1 | Resource Type 4 |                            Resource 8 |
|    Event 2 | Resource Type 2 |                            Resource 3 |
|    Event 2 | Resource Type 3 | Resource 11, Resource 12, Resource 13 |
|    Event 2 | Resource Type 4 |                           Resource 14 |
|    Event 2 | Resource Type 5 |   Resource 1, Resource 9, Resource 16 |

Then you will apply your PIVOT to this result:

SELECT [Event Name],
  [Resource Type 1], [Resource Type 2],
  [Resource Type 3], [Resource Type 4],
  [Resource Type 5]
FROM
(
  SELECT distinct e.[Event Name],
    e.[Resource Type],
    LEFT(r.ResourceName , LEN(r.ResourceName)-1) ResourceName
  FROM yourtable e
  CROSS APPLY
  (
      SELECT r.[Resource Name] + ', '
      FROM yourtable r
      where e.[Event Name] = r.[Event Name]
        and e.[Resource Type] = r.[Resource Type]
      FOR XML PATH('')
  ) r (ResourceName)
) src
pivot
(
  max(ResourceName)
  for [Resource Type] in ([Resource Type 1], [Resource Type 2],
                          [Resource Type 3], [Resource Type 4],
                          [Resource Type 5])
) piv

See SQL Fiddle with Demo. Your final result will then be:

| EVENT NAME |        RESOURCE TYPE 1 |        RESOURCE TYPE 2 |                       RESOURCE TYPE 3 | RESOURCE TYPE 4 |                     RESOURCE TYPE 5 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------
|    Event 1 | Resource 1, Resource 2 | Resource 3, Resource 4 |    Resource 5, Resource 6, Resource 7 |      Resource 8 |                              (null) |
|    Event 2 |                 (null) |             Resource 3 | Resource 11, Resource 12, Resource 13 |     Resource 14 | Resource 1, Resource 9, Resource 16 |

This works for me in SQL 2008, and it's dynamic - will handle additional Resource Type

Working SQLFiddle

IF OBJECT_ID('tempdb..#test') IS NOT NULL
  DROP TABLE #test

GO

CREATE TABLE #test
  (
     eventName    VARCHAR(30),
     resourceType VARCHAR(30),
     resourceName VARCHAR(30)
  );

INSERT INTO #test
VALUES      ('Event 1','Resource Type 1','Resource 1'),
            ('Event 1','Resource Type 1','Resource 2'),
            ('Event 1','Resource Type 2','Resource 3'),
            ('Event 1','Resource Type 2','Resource 4'),
            ('Event 1','Resource Type 3','Resource 5'),
            ('Event 1','Resource Type 3','Resource 6'),
            ('Event 1','Resource Type 3','Resource 7'),
            ('Event 1','Resource Type 4','Resource 8'),
            ('Event 2','Resource Type 5','Resource 1'),
            ('Event 2','Resource Type 2','Resource 3'),
            ('Event 2','Resource Type 3','Resource 11'),
            ('Event 2','Resource Type 3','Resource 12'),
            ('Event 2','Resource Type 3','Resource 13'),
            ('Event 2','Resource Type 4','Resource 14'),
            ('Event 2','Resource Type 5','Resource 9'),
            ('Event 2','Resource Type 5','Resource 16');

DECLARE @resourceTypes VARCHAR(max);

SELECT @resourceTypes = stuff((SELECT DISTINCT ',[' + resourceType + ']'
                               FROM   #test
                               FOR xml path('')), 1, 1, '');
DECLARE @query NVARCHAR(max);

SET @query = 'SELECT *
FROM   (SELECT eventName,
               resourceType,
               stuff((SELECT '','' + resourceName + ''''
                      FROM   #test b
                      WHERE  a.eventName = b.eventName
                             AND a.resourceType = b.resourceType
                      FOR xml path('''')), 1, 1, '''') resourceName
        FROM   #test a
        GROUP  BY eventName,
                  resourceType) AS data PIVOT (max(resourceName) FOR resourceType IN (' + @resourceTypes + ')) AS pvt';

EXEC(@query);

DROP TABLE #test;

Sql PIVOT and string concatenation aggregate

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