How to merge two columns value into single column in sql select statement

SQL Query to get aggregated result in comma separators along with group by column in SQL Server

My table would be in the below format

   |`````````|````````|
   |    ID   |  Value |
   |_________|________|
   |    1    |   a    |
   |_________|________|
   |    1    |   b    |
   |_________|________|
   |    2    |   c    |
   |_________|________|

Expected result should be in the below format

   |`````````|````````|
   |    ID   |  Value |
   |_________|________|
   |    1    |  a,b   |
   |_________|________|
   |    2    |   c    |
   |_________|________|

Sql Query 

You want to use FOR XML PATH construct:

select ID, stuff((select ', ' + Value from YourTable t2 where t1.ID = t2.ID for xml path('')), 1,2,'') [Values] from YourTable t1 group by ID
The STUFF function is to get rid of the leading ', '.