-- 테이블 생성 CREATE TABLE topic ( id NUMBER NOT NULL, title VARCHAR2(50) NOT NULL, description VARCHAR2(4000), created DATE NOT NULL, CONSTRAINT PK_TOPIC PRIMARY KEY(id) -- 제약조건, 유일무이해야 한다.(PRIMARY KEY) ); -- 테이블 조회 SELECT id FROM topic WHERE id = 1; SELECT id FROM topic WHERE id > 1; SELECT id FROM topic; -- 데이터 정렬 (DESC 내림차순, ASC 오름차순) SELECT * FROM topic ORDER BY id DESC; SELECT * FROM topic ORD..