title: error appear when I execute a SQL request
body: <p>I have a SQL request that I can't execute ,this error appear:<br><br>
      <strong>To disable safe mode, toggle the option in Preferences -> SQL Editor -> Query Editor   and reconnect.
  You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column</strong></p>
  
  <p>My request:</p>
  
  <pre><code>update customfieldvalue
  set stringvalue="****"
  where customfieldvalue.customfield IN 
  (select customfield.id 
  from customfield 
  where customfield.cfname="Resoltion" 
  and customfieldvalue.issue=12345);
  </code></pre>
  
  <p>how can I fix this problem,because in my production environment I can't do this manipulation?
  PS:I'am using mysql</p>