Oracle添加外鍵約束

1.創建表時並創建外鍵約束

create table score(
scoreID int primary key,
stuID int ,
score int constraint ck_score check(score between 0 and 100),
courseName varchar2(20) not null,
constraint fk_stuId foreign key(stuID) references student(stuID)
);

2.表創建成功后再添加外鍵約束

--添加外檢約束 ：alter table 從表表名 add constraint 外鍵約束名稱 foreign key(列名) references 主表名稱(主鍵列名)
alter table score add constraint ck_stuID foreign key(stuID) references student(stuID);