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Concate Set Of Rows With Comma (or Any) In A Single String

I would like to share cool feature of SQL Server with you guys like:
Please use the following query when concatenate two or more rows with comma (or any you want) in a single string.

SELECT STUFF((SELECT ',' + RTRIM(RegionDescription) FROM Region FOR XML PATH('')),1,1,'') AS 'Regions'

This would be also useful when you have to check between condition in SQL Query.

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