sql - Concat with NULL value -

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I have a query that looks something like this: 

  separate call 1 Choose, select Ltim (str (col2)), 'from' @temp t2, where x2 path t2.col1 = t1.col1 (@ ')) @temp t1 to col2   < P> Some values ​​in Col2 are zero, so instead of displaying a string with zero, that part is completely missing, i.e.  
 should be col2  
  3 , 4,3, NULL, 2,3,4,3,2,   
 but instead I'm getting:  
  3,4, 3,2,3,4,3, 2,   
 How can I fix this Huh? To get tap output to 
 
, you have to change the zero value in the string 'NULL'. It also means that you have to enter numeric values ​​in a string for a corresponding type of field;  
  Select 1, (select COALESCE (CAST (col2 as VARCHAR), 'NULL'), 'FROM @temp T2 WHERE t2.col1 = t1.col1 XML path ('')) @temp t1   
 from col2.

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