DATASET 을 만들기 위한 코드입니다. DROP TABLE IF EXISTS quarterly_sales; CREATE TABLE quarterly_sales ( year integer , q1 integer , q2 integer , q3 integer , q4 integer ); INSERT INTO quarterly_sales VALUES (2015, 82000, 83000, 78000, 83000) , (2016, 85000, 85000, 80000, 81000) , (2017, 92000, 81000, 80000, 90000 ) , (2018, 80000, 83000, 90000, 91000 ) , (2019, 98000, 83000, NULL , NULL ) ; 조건문 비교(CASE) CA..
