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????