update

mec-biz/src/main/resources/config/mybatis/CourseScheduleMapper.xml

@@ -1224,7 +1224,7 @@
             cs.leave_student_num_,
             cs.schoole_id_
         FROM
-            course_schedule cs
+            course_schedule cs left join class_group cg on cs.class_group_id_ = cg.id_
         WHERE (cs.class_date_ BETWEEN DATE_FORMAT(#{startTime},'%Y%m%d') AND DATE_FORMAT(#{endTime},'%Y%m%d'))
             AND cs.del_flag_!=1 AND cg.del_flag_!=1
     </select>