title: ORA-00906 Missing left parenthesis error
body: <p>I have just started using Oracle SQL and have come across an error </p>
  
  <blockquote>
    <p>ERROR at line 2: ORA-00906: missing left parenthesis</p>
  </blockquote>
  
  <p>My code is this:</p>
  
  <pre><code>CREATE TABLE Employees(    
  dept_id varchar2(4), PRIMARY KEY, NOT NULL,
  Dept_name varchar2(30), NOT NULL, 
  Manager_id varchar2(4));
  </code></pre>
  
  <p>Why am I getting this error and how do I go about fixing it? 
  As I am expecting a table to be created with 3 columns (dept_id, Dept_name, Manager_id)</p>