title: Mysql IF NOT EXISTS then select
body: <p>i try to select all rows "labels" from a table by parent_id and language.
  Default language is en.</p>
  
  <pre><code>list = SELECT * FROM labels WHERE parent_id = x AND lang='de'
  
  if( list.isEmpty() ){
     list = SELECT * FROM labels WHERE parent_id = x AND lang='en'
  }
  </code></pre>
  
  <p>how to handle this using only one MySQL Statement?</p>
  
  <p>many Thanks</p>