How much did the the player with first name Len and last name Barker earn between 1985 to 1990 in total?
return players ;return #1 with  first name Len ;return #2 with  last name Barker ;return how much #3 earn ;return #4 between 1985 to  1990 ;return the  sum of #5
['select', 'filter', 'filter', 'project', 'filter', 'aggregate']