ผู้เล่นที่มีชื่อ Len และนามสกุล Barker มีรายได้รวมระหว่างปี 1985 ถึง 1990 เท่าไหร่?
How much did the the player with first name Len and last name Barker earn between 1985 to 1990 in total?
salary = pd.DataFrame(columns=['salary', 'player_id', 'year']); player = pd.DataFrame(columns=['player_id', 'name_first', 'name_last'])
salary[(salary['player_id'].isin(player[(player['name_first'] == 'Len') & (player['name_last'] == 'Barker')]['player_id'])) & (salary['year'].between('1985', '1990'))]['salary'].sum()