update 取课程组最后的老师

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

@@ -2547,6 +2547,7 @@
         <foreach collection="classGroupIds" item="classGroupId" open="(" close=")" separator=",">
             #{classGroupId}
         </foreach>
+        GROUP BY class_group_id_
         )
     </select>
 </mapper>