title: SQL getting row count optimization
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/59294/in-sql-whats-the-difference-between-countcolumn-and-count">In SQL, what&#39;s the difference between count(column) and count(<em>)?</a><br>
    <a href="https://stackoverflow.com/questions/1221559/count-vs-count1">Count(</em>) vs Count(1)</a>  </p>
  </blockquote>
  
  
  
  <p>I have big tables which keep long texts for example email content or news. And my question
  is there any difference for performance for counting table rows :</p>
  
  <pre><code>SELECT COUNT(*) FROM table_name
  
  SELECT COUNT(t.id) FROM table_name as t
  </code></pre>
  
  <p>Which one is better? or the latter one will be optimized by query optimizer? Is there any documentation regarding this?</p>