แสดงภาพแผนภูมิแท่งว่ามีผู้เล่นกี่คนจากแต่ละประเทศ?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Visualize a bar chart for how many players are from each country?It is not neccessary to use all the tables.
 player:  Player_ID [ int]  Player [ text]  Years_Played [ text]  Total_WL [ text]  Singles_WL [ text]  Doubles_WL [ text]  Team [ int] 
SELECT Country_name, COUNT(*) FROM country AS T1 JOIN match_season AS T2 ON T1.Country_id = T2.Country GROUP BY T1.Country_name