解决班级查询重复的问题

src/main/resources/mapper/banding/BandingTaskClassMapper.xml

@@ -23,6 +23,7 @@
         LEFT JOIN xjr_user t3 ON t1.teacher_id = t3.id
         LEFT JOIN base_classroom t4 ON t1.classroom_id = t4.id
         LEFT JOIN banding_task_major_condition t5 ON t1.major_set_id = t5.major_set_id AND t5.delete_mark = 0
+        AND t5.banding_task_id = #{dto.bandingTaskId}
         WHERE t1.delete_mark = 0 and t1.banding_task_id = #{dto.bandingTaskId}
     </select>