T-SQL, Row Value Concatenation Unsing "FOR XML PATH"

Sometime, could be usefull to concatenate row values.
For example you have a select that returns this result:

A

B

C

D

but you need:

A, B, C, D

the seguente script makes this: a Row Value Concatenation.

SELECT STUFF((

      SELECT

            ', ' + ltrim(rtrim(Your_Field))

      FROM

            Your_Table

      FOR XML PATH('')

),1,2,'')

My Two Cents ...