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The Many Uses of Coalesce in SQL Server
Many times people come across the Coalesce function and think that it is just a more powerful form of ISNULL. In actuality, I have found it to be one of the most useful functions with the least documentation. In this tip, I will show you the basic use of Coalesce and also some features you probably never new existed.
Source: Ken Simmons, MSSQLTips.com