Compute the total salary that the player with first name Len and last name Barker received between 1985 to 1990.
select sum(t1.salary) from salary as t1 join player as t2 on t1.player_id = t2.player_id where t2.name_first = 'Len' and t2.name_last = 'Barker' and t1.year between 1985 and 1990;