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0. 목표 - PRECEDING 을 통한 증감비교 1. 실습 1) 테이블 생성 CREATE TABLE sql_test.company ( company varchar(12), year int, sale int ); 2) 데이터 삽입 INSERT INTO sql_test.company(company, year, sale) VALUES ('A', 2010, 100); INSERT INTO sql_test.company(company, year, sale) VALUES ('A', 2011, 90); INSERT INTO sql_test.company(company, year, sale) VALUES ('A', 2012, 110); INSERT INTO sql_test.company(company, year, s..