create table EMPLOYEES (  
  empno             number,  
  name              varchar2(50) not null,  
  job               varchar2(50),  
  manager           number,  
  hiredate          date,  
  salary            number(7,2),  
  commission        number(7,2),  
  deptno           number,  
  constraint pk_employees primary key (empno),  
  constraint fk_employees_deptno foreign key (deptno) 
      references DEPARTMENTS (deptno)  
);