体验人数，直接查student表

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

@@ -266,6 +266,7 @@
         select teacher_id_ 'key', count(*) 'value'
         FROM student
         WHERE FIND_IN_SET(teacher_id_, #{teacherIds})
+          AND operating_tag_ = 1
         GROUP BY teacher_id_
     </select>