title: Mysql trim threm begining of a field up to a designated string
body: <p>I have a mysql database <code>xxl_wordpress</code> with a table <code>wp_posts</code>
  the has a field  <code>post_content</code> </p>
  
  <p><code>post_content</code> contains imported HTML pages.</p>
  
  <p>I am trying to remove everything before the <code>&lt;body&gt;</code> tag within the content of that field for each record.   </p>
  
  <p>Is there an SQL query that will do this? I tried searching for it but was not able to find it.  </p>