정의된 테이블 예시 테이블 명: article attribute type id (PRIMARY KEY) bigint title varchar content varchar created_at datetime 테이블 명: comment attribute type id (PRIMARY KEY) bigint article_id (FOREIGN KEY) bigint content varchar created_at datetime 데이터 조회 SELECT article.id, title, comment.content FROM article, comment WHERE comment.id = 10 and comment.article_id = article.id; WHERE comment.id selection cond..