title: error "%s: invalid identifier" occurs when I create a table in Oracle DB
body: <p>when I create a table like this:</p>
  
  <pre><code>create table DBDI_HIREDETAIL(
  HireID int not null,
  EquipID int not null,
  Quantity int,
  TotalFee float,
  Comment varchar(200)
  );
  </code></pre>
  
  <p>The error occurs like this:</p>
  
  <blockquote>
    <p>Error at Command Line:  "TotalFee float"
    Error report:
    SQL Error: ORA-00904: : invalid identifier
    00904. 00000 -  "%s: invalid identifier"</p>
  </blockquote>
  
  <p>I don't understand why my code has an error, it seems to be fine.</p>