title: What is wrong with this query ( multiple update table )
body: <p>This actually makes my phpmyadmin stop working.</p>
  
  <pre><code>SET @admin_mail = "mail@mail.com";
  --  5. SET ORDER MAIL
  
  UPDATE 
  sales_flat_order, 
  sales_flat_order_address, 
  -- sales_flat_order_status_history, 
  sales_flat_quote, 
  sales_flat_quote_address
  
  SET 
  sales_flat_order.customer_email = @admin_mail,
  sales_flat_order_address.email = @admin_mail,
  sales_flat_quote.customer_email = @admin_mail,
  sales_flat_quote_address.email = @admin_mail;
  </code></pre>