oracle数据库

create table NEO2013_GRP5_CLASS_COURSE (CLASS_COURSE_ID varchar(50) primary key, START_TIME timestamp not null, END_TIME timestamp not null, TEACHER varchar(50) not null, TEACHER_EMAIL varchar(50), CLASS_ID varchar(50) not null, COURSE_ID varchar(50) not null, constraint class_course_class_fk foreign key(CLASS_ID) references NEO2013_GRP5_CLASS(CLASS_ID), constraint class_course_course_fk foreign key(COURSE_ID) references NEO2013_GRP5_COURSE(COURSE_ID) )