테이블 생성코드 Create table If Not Exists Sales (sale_id int, product_id int, year int, quantity int, price int) Create table If Not Exists Product (product_id int, product_name varchar(10)) Truncate table Sales insert into Sales (sale_id, product_id, year, quantity, price) values ('1', '100', '2008', '10', '5000') insert into Sales (sale_id, product_id, year, quantity, price) values ('2', '100', '200..