title: SELECT INTO and "Undeclared variable" error
body: <p>When I try to execute following query:</p>
  
  <pre><code>SELECT id_subscriber
    INTO newsletter_to_send
    FROM subscribers 
  </code></pre>
  
  <p>I get an error:</p>
  
  <blockquote>
    <p><em>#1327 - Undeclared variable: newsletter_to_send</em></p>
  </blockquote>
  
  <p>What is wrong with that query ?</p>