Error at line 1: ORA-00907: missing right parenthesis - sql

Question

I believe I have the right syntax for SQL plus command, I have tried different ways to do it but I am getting the same error message. I don't know why i am getting this "missing right parenthesis error" any help will be appreciated thank you in advance.
here is my code:
create table PUBLISHERS (
NAME varchar2(50) primary key,
address varchar2(50), phone integer(10)
);

Answer 1

The integer data type does not use a length qualifier. integer is equivalent to number(38,0).
SQL> ed
Wrote file afiedt.buf
1 create table PUBLISHERS (
2 NAME varchar2(50) primary key,
3 address varchar2(50),
4 phone integer
5* )
SQL> /
Table created.
If you want to limit the size, use a number
SQL> ed
Wrote file afiedt.buf
1 create table PUBLISHERS (
2 NAME varchar2(50) primary key,
3 address varchar2(50),
4 phone number(10)
5* )
SQL> /
Table created.
Since you are never going to do numeric operations on a phone number, however, while it is generally likely that you will perform string manipulation on it to format phone numbers for display, it would generally make sense to store a phone number as a character string rather than as a number. You can add a CHECK constraint that ensures the format is correct.
SQL> ed
Wrote file afiedt.buf
1 create table PUBLISHERS (
2 NAME varchar2(50) primary key,
3 address varchar2(50),
4 phone varchar2(10)
5* )
SQL> /
Table created.

Answer 2

INTEGER is not a Oracle Built-In data type. It is just a ANSI format that is supported in oracle. The oracle representation of INTEGER is NUMBER (38). Use NUMBER datatype instead.
CREATE TABLE publishers(
name VARCHAR2(50) PRIMARY KEY,
address VARCHAR2(50),
phone NUMBER(10)
);

Answer 3

create table doctor_details(doctor_id number(10),
username varchar2(30) not null,
password varchar2(30) not null,
name varchar2(30) not null,
father_name varchar2(30) not null,
gender varchar2(6) not null check(gender in('male','female)),
email varchar2(50) not null,
contact_no number(10) not null,
qualification varchar2(50) not null,
specialization varchar2(5) not null,
date_of_birth date not null,
date_of_joining date not null,
primary key(doctor_id))
error is right parenthesis missing