Concat function is used concatnating the values among the different arguments. Syntax: Concat([String1],[String2]..[StringN]); DECLARE @FName VARCHAR ( 50 ), @LName VARCHAR ( 50 ); SET @FName = 'Rakesh' ; SET @LName = 'Kalluri' ; SELECT CONCAT ( @FName , ' ' , @LName ) as [FullName] ; Output: Rakesh Kalluri --Before SQL 2012 Versions we can use like this way DECLARE @FName VARCHAR ( 50 ), @LName VARCHAR ( 50 ); SET @FName = 'Rakesh' ; SET @LName = 'Kalluri' ; SELECT @FName + ' ' + @LName as [FullName] ; Output: Rakesh Kalluri --But Before SQL 2012 Versions there are 2 problems when we contacting . --1.Need to replace NULL Value to Empty.if we directly concat NULL Value the Entire result also NULL. --Before 2012: DECLARE @FName VARCHAR ( 50 ), @LName VARCHAR ( 50 ); SET @FName = 'Rakesh' ; SELECT @FName + ' ' + @LName a...