title: Using normal SQL with Active Records in Code Igniter
body: <p>I have a single normal SQL statement in the middle of my Active Records query. Is there any way I can 'add' this query to the AR one without having two independent queries? The SQL is as follows if someone would help me 'convert' it into Active Records-style in case it doesn't work.</p>
  
  <pre><code>SELECT birthday
  FROM usertable
  WHERE STR_TO_DATE(birthday, '%d.%m.%Y')
  BETWEEN $minimumDate AND $maximumDate
  </code></pre>