建表时ORA-00907: 缺失右括号?

Question

SQL> create table books(
  2  isbn varchar2(50) primary key,
  3  title varchar2(50),
  4  author varchar2(50) ,
  5  pubdate date,
  6  publisher_id number(2) references publishers(publisher_id)
  7  cost number(6,2),
  8  retail number(6,2),
  9  category varchar2(50)
 10  )
 11  tablespace users;
cost number(6,2),
*
第 7 行出现错误:
ORA-00907: 缺失右括号

到底是怎么回事????

Answer 1

publisher_id number(2) references publishers(publisher_id)这行后面少了逗号