แสดงชื่อและเพศของผู้เล่นกับโค้ชที่เริ่มหลังปี 2554
Show the names and genders of players with a coach starting after 2011.
df_player = pd.DataFrame(columns=['Player_name', 'gender', 'Player_ID']); df_player_coach = pd.DataFrame(columns=['Coach_ID', 'Player_ID', 'Starting_year']); df_coach = pd.DataFrame(columns=['Coach_ID'])
df_player_coach[df_player_coach['Starting_year'] > 2011].merge(df_player, on='Player_ID')[['Player_name', 'gender']]