title: What does the 'sq' mean in this sql statement?
body: <p>I read one SQL statement like this:</p>
  
  <pre><code>select top 1 id from (
    select top 1 id from sysobjects where xtype='u' order by id
  ) sq order by id desc
  </code></pre>
  
  <p>I don't understand what 'sq' in the last line stands for. Thanks for any helpful answers.s</p>