试试这个:
$this->db->join('credentials', 'tblanswers.answerid = credentials.cid');或者
$this->db->join('credentials', 'tblanswers.answerid = credentials.cid', 'inner');并打印结果以查看是否要

试试这个:
$this->db->join('credentials', 'tblanswers.answerid = credentials.cid');或者
$this->db->join('credentials', 'tblanswers.answerid = credentials.cid', 'inner');并打印结果以查看是否要