มีผู้เล่นกี่คนในทีม Boston Red Stockings ในปี 2000
How many players were in the team Boston Red Stockings in 2000?
df_salary = pd.DataFrame(columns=['team_id', 'year']); df_team = pd.DataFrame(columns=['team_id_br', 'name'])
df_salary[(df_salary['year'] == '2000') & (df_salary['team_id'] == df_team[df_team['name'] == 'Boston Red Stockings']['team_id_br'].values[0])].shape[0]