Concat all column values in sql

Question

How to concat all column values from differenct rows returned from a sql query into one value? This is an example:

a query returns:

FOO
------
RES1

RES2
         


        

Answer 1

SQL Server 2008 R2:

declare @ColumnNameList VARCHAR(MAX)


 SELECT @ColumnNameList  = COALESCE(@ColumnNameList +',' ,'') + ColumnName 
                     FROM 
                       <>

select @ColumnNameList 

                                                        

              
                
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