假设students(studentID,studentname,classID)和classes(classID,classname)
怎么建关于studentname和classname这两个字段的索联合引啊？？？高手请教啊SOS!
------解决方案--------------------
create table students
(studentID number(8),
studentname varchar2(20),
classID number(8)
..);
create table classes
(classID number(8),
classname varchar2(20),
....
);