Database: baseball_1
Question: What is the sum of salary that the player with first name Len and last name Barker earn between 1985 to 1990 in total?
SQL: 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