ORA-00957: duplicate column names

ORA-00957: duplicate column names

1. Error description

ORA-00957: duplicate column names

2. Error cause

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) 

When creating a database table, the stu_age field with the same name is defined, so an error is returned.

3. Solution

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)

Remove a stu_age Field