title: Oracle alter table insufficient privileges
body: <p>I have just installed oracle 12c and then I am trying to grant user various rights.</p>
  <p>I am logged in as system and I had given rights for <code>create user</code> which worked. However, while granting rights for <code>alter table</code> it gave me error</p>
  <p><code>ORA-00990: missing or invalid privilege</code></p>
  <p>Researching on this problem brought me to another <a href="https://stackoverflow.com/questions/19216392/insufficient-privileges-when-creating-tables-in-oracle-sql-developer?s=807886a2-f4d6-4a96-b256-3b36c5e700d0">post</a> on SO. The Comments on this post indicated that it is because I am not logged in as <code>GLOBAL</code> user. However I don't know how to log in as <code>GLOBAL</code> user.</p>
  <p>Do I have to create one ?</p>
  <p>Is there any alternative solution ?</p>