Oracle Database Discussions

create table employee(
emp_id varchar(10) constraint PK_employee Primary Key,
firstname varchar2(20),
lastname varchar2(20),
phone number(11));

Table created.

create table empinformation
(
mobileno number(6) constraint pk_empinformation primary key,
address varchar(100),
salary number(10),
personalid number(10) constraints fk_employees_section references employee(emp_id) );



ERROR at line 6:
ORA-02267: column type incompatible with referenced column type