แสดงจำนวนไพ่ในรหัสประเภทไพ่ที่แตกต่างกันในแผนภูมิแท่ง ไม่จำเป็นต้องใช้ตารางทั้งหมด
Show the number of cards in different card type code in a bar chart.It is not neccessary to use all the tables.
 Customers:  customer_id [ INTEGER]  customer_first_name [ VARCHAR(20)]  customer_last_name [ VARCHAR(20)]  customer_address [ VARCHAR(255)]  customer_phone [ VARCHAR(255)]  customer_email [ VARCHAR(255)]  other_customer_details [ VARCHAR(255)] 
SELECT card_type_code, COUNT(card_type_code) FROM Customers_Cards GROUP BY card_type_code