An Example World Database - 기본 SQL many to one, one to one의 관계는 별도의 table로 저장하지 않음 (foreign key만 가지고 있으면 되므로) >> City(Name, Country, Pop,Capital, Shape) >> River(Name, Origin, Length, Shape) Origin = country name ** 밑줄은 foreign key Three Components of SQL 1. Data Definition Language (DDL) : 정의표 Creation and modification of relational schema Schema objects include relations, indexes, etc. 2. Data..
