title: How to create an APEX_COLLECTION?
body: <p>I want to create an apex_collection in the Oracle SQL Developer for my apex webapplication. 
  Here's my code:</p>
  
  <pre><code> apex_collections.create_or_truncate_collection('TEST');
  </code></pre>
  
  <p>After running the statement I get the following:</p>
  
  <p><a href="https://i.stack.imgur.com/50c6O.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/50c6O.png" alt="enter image description here"></a></p>
  
  <p>If I enter the select-statement: </p>
  
  <pre><code>SELECT *
    FROM apex_collections
   WHERE collection_name = 'TEST';
  </code></pre>
  
  <p>afterwards, I get this:</p>
  
  <p><a href="https://i.stack.imgur.com/gZmJ8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gZmJ8.png" alt="enter image description here"></a></p>
  
  <p>It seems to me that no collection has been created,although there is no error code. What am I doing wrong? Why is the collection not created? I also tried to run the statement in the SQL Workshop of Oracle APEX, but the command is unknown there. I am using Oracle 12c version.</p>