Attributes type : 어트리뷰트 타입, 어트리뷰트 종류.
•An entity is represented by a set of attributes >Example: a instructor entity= {(ID,76766), (name, Crick), (dept_name, Biology), (salary, 72000)} a instructor entity= {(ID,45565), (name, Katz), (dept_name, Physics), (salary, 55000)} entity는 어트리뷰트의 집합으로 나타난다. •Domain – the set of permitted values for each attribute >Semester -> {Fall, Winter, Spring, Summer} >course_id -> the set of all text str..
2020. 12. 7.
