create table qhh.book_load(
student_ID number(10),
book_ID number(10),
student_name varchar2(30),
description varchar2(30),
constraint book_load_pk
primary key (student_ID),
constraint unique_name
unique(student_name,book_ID),
using index tablespace INDX
constraint assigned_book_fk
foreign key (book_id)
references qhh.book
)
tablespace oracleDB;
ORA-00902: 无效数据类型
不只是什么原因

oracle 建表时报错!!!
create table qhh.book_load(
student_ID number(10),
book_ID number(10),
student_name varchar2(30),
description varchar2(30),
constraint book_load_pk
primary key (student_ID),
constraint unique_name
unique(student_name,book_ID),
using index tablespace INDX
constraint assigned_book_fk
foreign key (book_id)
references qhh.book
)
tablespace oracleDB;


using index talespace indx
      *
ERROR 位于第 8 行:
ORA-00902: 无效数据类型
不只是什么原因