SQL - Combine Multiple Rows of Data to One Row and Column

Question

I'm looking to create a SQL Server query that will combine resources with the same Task into one row/record string using three tables. My SQL Server query below doesn't seem to be working correctly and takes a very long time to execute and then errors out. Thanks!

Task Table

TaskUID
TaskName

Assignment Table

TaskUID
ResourceUID

Resource Table

ResourceUID
ResourceName

Before

**Task Name     Resource Name**
Weapon Launch   Amy
Weapon Launch   Sam
Weapon Launch   Marisa
Weapon Launch   Katy
Weapon Launch   John
Sweating Tears  Marisa
Sweating Tears  Joe
Sweating Tears  Katy
Sweating Tears  Michael
Ramp Diver      Joe
Ramp Diver      Michael

After

**Task Name     Resource Name**
Weapon Launch   Amy; Sam; Marisa; Katy; John
Sweating Tears  Marisa; Joe; Katy; Michael
Ramp Diver      Michael; Joe

Query

SELECT T.TaskName,
STUFF(( SELECT ', ' + R.RESOURCENAME
FROM 
[Resource Table] R
LEFT JOIN [Assignment Table] A ON R.ResourceUID=A.ResourceUID
WHERE
A.TASKUID=T.TaskUID
Group by R.RESOURCENAME
FOR XML PATH('')), 1, 1,'') Resources
FROM [Task Table] T
INNER JOIN [Assignment Table] A ON T.TASKUID=A.TASKUID

Answer 1

Please try:

SELECT T.TaskName, Resources
FROM TaskTable T
CROSS APPLY (
  SELECT 
    STUFF(( SELECT ', ' + R.RESOURCENAME
      FROM [ResourceTable] R
      INNER JOIN [AssignmentTable] A ON R.ResourceUID=A.ResourceUID
      WHERE A.TASKUID = T.TASKUID
      Group by R.RESOURCENAME
      FOR XML PATH('')), 1, 1,'') Resources
) N(Resources)

SQL Fiddle

Answer 2

Thanks to Nizam, I figured out that I should be using the tables in the database instead of views, since I do not have permissions to create indexes. The built-in indexes allowed for faster queries.

SELECT DISTINCT
T.TASK_NAME,
    STUFF((SELECT ', '+ R.RES_NAME
            FROM PUB.MSP_RESOURCES R
            JOIN PUB.MSP_ASSIGNMENTS A ON A.RES_UID=R.RES_UID
            WHERE A.TASK_UID=T.TASK_UID
            AND R.RES_TYPE IN(2)
            GROUP BY R.RES_NAME
            FOR XML PATH(''), TYPE).value('.','VARCHAR(max)'), 1, 1, '') AS RESOURCES