title: What is wrong with this trigger? After Insert Update
body: <p>I have problem with simple trigger on MySQL.</p>
  
  <pre><code>DELIMITER $$
  CREATE TRIGGER cust_tracer
  AFTER INSERT ON custom_values 
  FOR EACH ROW
  BEGIN
    UPDATE 'custom_values' set 
  
    (VALUE = CONCAT('https://tracker.123e33.eu/view.php?id=', VALUE))
    where custom_field_id=84;
  
    END$$
  </code></pre>
  
  <p>the VALUE is a column in table custom_values thats named VALUE</p>
  
  <p>I got the following error:</p>
  
  <blockquote>
    <p>#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''custom_values' set<br>
      VALUE = CONCAT('<a href="https://tracker.123e33.eu/view.php?id=" rel="nofollow noreferrer">https://tracker.123e33.eu/view.php?id=</a>' at line</p>
  </blockquote>