Mariadb错误错误号码：1064

Question

您好我在PHP中的SQL查询错误：

  

发生数据库错误

     

错误号码：1064

     

您的SQL语法有错误;检查与您的MariaDB服务器版本对应的手册，以便在第1行') ORDER BY FIELD(qbank.qid, )'附近使用正确的语法

SELECT qbank.*,question_category.* FROM qbank JOIN question_category ON qbank.cid = question_category.cid where qbank.institute_id = '1' and qid in () ORDER BY FIELD(qbank.qid, )

代码如下：

$query = $this -> db -> query("SELECT qbank.*,question_category.* FROM qbank JOIN question_category ON qbank.cid = question_category.cid where  qbank.institute_id = '$institute_id' and qid in ($assignqids) ORDER BY FIELD(qbank.qid, $assignqids ) ");
    $qidarr=$query->result_array();