title: Oracle: ORA-00955: name is already used by an existing object
body: <p>I tried to create this table:</p>
  
  <pre><code>create table departments
  (
    departments_id number primary key,
    departments_name varchar2(30), 
    departments_block_number number
  );
  </code></pre>
  
  <p>But I got this error:</p>
  
  <blockquote>
    <p>create table departments<br>
                    *<br>
    ERROR at line 1:<br>
    ORA-00955: name is already used by an existing object</p>
  </blockquote>