title: Query = Unknown system variable 'c3'
body: <p>I'm trying to use both <code>REPLACE</code> and <code>SET</code>in a query, whithout any succes!</p>
  
  <p>Error message:</p>
  
  <p><code>Unknown system variable 'c3'</code></p>
  
  <p>What am i doing wrong?</p>
  
  <p><strong>PHP</strong></p>
  
  <pre><code> $query = "SET NEW.c3 = CONCAT(OLD.c3, NEW.:c3);
             REPLACE INTO table(
                  c1,
                  c2,
                  c3)
             VALUES(
                  :c1,
                  :c2,
                  :c3)";
  $query_params = array(
                  ':c1' =&gt; $c1,
                  ':c2' =&gt; $c2,
                  ':c3' =&gt; $c3); 
  </code></pre>