Show the number of transactions with transaction type code "SALE" for different investors if it is larger than 0.
return different investors ;return transactions of #1 ;return transaction type codes of #2 ;return #2 where #3 is SALE ;return number of  #4 for each #1 ;return #5 that are higher than 0
['select', 'project', 'project', 'comparative', 'group', 'filter']