title: i get this error when i run my code "Error report - ORA-00902: invalid datatype 00902. 00000 - "invalid datatype" *Cause: *Action:"
body: <p>This is <code>project_submissions</code> database script:   </p>
  
  <pre><code>create table project_submissions
      ( project_id varchar2 (5),
      component_submitted varchar (250),
      date_submitted TIMESTAMP,
      constraint (PROJECT_ID)FOREIGN KEY, Project_description (PROJECT_ID)
      );
  </code></pre>
  
  <p>this is my table desc for project_description</p>
  
  <pre><code>Name            Null?    Type         
  --------------- -------- ------------ 
  PROJECT_ID      NOT NULL VARCHAR2(5)  
  SUPERVISOR_ID            VARCHAR2(5)  
  PROJECT_TITLE            VARCHAR2(25) 
  PROJECT_SUMMARY          VARCHAR2(25) 
  </code></pre>