fix 做题

zhongzheng-system/src/main/resources/mapper/modules/user/UserExamRecordMapper.xml

@@ -170,7 +170,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
                     e.exam_id,
                     q.*
                 FROM
-                    ( SELECT exam_id, group_concat( do_question_ids ) AS ids FROM user_exam_record WHERE user_id = #{userId} AND order_goods_id = #{orderGoodsId} and `status` = 1 GROUP BY exam_id ) e
+                    ( SELECT exam_id, group_concat( do_question_ids ) AS ids FROM user_exam_record WHERE user_id = #{userId} AND order_goods_id = #{orderGoodsId} and do_question_ids is not null and `status` = 1 GROUP BY exam_id ) e
                         LEFT JOIN question q ON FIND_IN_SET( q.question_id, e.ids )) AS eq
     </select>