Question: How much did the 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