ORA-00957:重复的列名_MySQL

ORA-00957: 重复的列名

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
)
 

create table info(
 stu_id varchar(7) not null,
 stu_name varchar2(20) not null,
 stu_age varchar(2) not null,
 stu_seat number(2) not null,
 enter_date date,
 stu_add varchar2(100) default '',
 class_no varchar2(4) not null
)