SELECT * 
  FROM mytable mt1
  WHERE mt1.ItemCode = 1 
	AND NOT EXISTS ( SELECT * FROM mytable mt2 
			  WHERE mt1.FldName = mt2.FldName)
UNION ALL
SELECT * 
  FROM mytable mt1
  WHERE mt1.ItemCode = 2 
	AND NOT EXISTS ( SELECT * FROM mytable mt2 
			  WHERE mt1.FldName = mt2.FldName)