Compute the total salary that the player with first name Len and last name Barker received between 1985 to 1990.
return players ;return first name  of #1 ;return #1 where #2 is Len ;return last name  of #3 ;return #3 where #4 is Barker ;return salaries of #5 ;return #6 between 1985 and  1990 ;return sum of #7
['select', 'project', 'comparative', 'project', 'comparative', 'project', 'filter', 'aggregate']