Join query in codeigniter 

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Sol 1: 

U can modify code like

$this->db->join('credentials', 'tblanswers.answerid = credentials.cid', 'outer'); 
$query 

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= $this->db->get('tblanswers');
return $query->result();

Sol 2: 

Try with this:

$this->db->join('credentials', 'tblanswers.answerid = credentials.cid');

Or

$this->db->join('credentials', 'tblanswers.answerid = credentials.cid', 'inner');

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And print the result to see if is what you want