title: Explain to obtain the query time?
body: <p>I trying to use command <code>Explain</code> to obtain the query time of my mySql database, however it return always 0.00sec, am i misunderstand the Explain command usage in mySql?</p>
  
  <p>Below is my command:</p>
  
  <pre><code>mysql&gt; explain select * from table;
  </code></pre>
  
  <p>0.00 sec</p>
  
  <pre><code>mysql&gt; select * from table;
  </code></pre>
  
  <p>15 sec</p>
  
  <p>why the explain wouldn't return the same query time result as i using the same command?</p>
  
  <p>Pls help</p>