ORA-00957: 重复的列名

1、毛病描写

ORA-00957: 反复的列名

SQL> create table info(
  2     stu_id varchar2(7) not null, 
  3     stu_name varchar2(20) not null,
  4     stu_age varchar(2) not null,
  5     stu_age number(2) not null,
  6     stu_seat number(2) not null,
  7     enter_date date,
  8     stu_add varchar2(100) default "",
  9     class_no varchar2(4) not null
 10  );
 
create table info(
   stu_id varchar(7) not null,
   stu_name varchar2(20) not null,
   stu_age varchar(2) not null,
   stu_age number(2) not null,
   stu_seat number(2) not null,
   enter_date date,
   stu_add varchar2(100) default "",
   class_no varchar2(4) not null
)
 SQL> create table