How to Get multiple user update history in SQL Server 2008

Question

Please give some idea about how to get the users update history of particular id in SQL Server 2008. I need to display their user names in (update) username column.

Example:

In database I have update username column in z table. The usernames are like shown here:

username
1.x
2.y

What I need is:

first x username going to update some values for ID:1 in z table and save the details. again y username also update some values for same ID in z Table and save details.

In the end, I need an output that looks like this

Z table

    ID | column1| column2| update_username
     1 |    a   |  b     |    x,y

Answer 1

Use this query to ge the expected result in MSSQL server .

CREATE TABLE #Z
(
 ID INT,
 Name VARCHAR(50)
 )

 INSERT INTO #Z 
 SELECT 1, '1.x' UNION
 SELECT 1, '2.y' UNION
 SELECt 2, '1.x' UNION
 SELECT 2, '2.y'

  SELECT A.ID,  Update_username = STUFF(
    (SELECT ', ' + SUBSTRING(B.Name, CHARINDEX('.', B.Name) + 1, LEN(B.Name))  
     FROM #Z AS B 
     WHERE B.ID = A.ID 
     GROUP BY B.Name 
     FOR XML PATH(''), type).value('.', 'varchar(max)'), 1,2,'') 
 FROM #Z AS A
 GROUP BY A.ID