查询没有没有某种类型的班级的学生，可通过多声部过滤

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

@@ -779,7 +779,7 @@
     <select id="queryCanAddStudent" resultMap="com.ym.mec.biz.dal.dao.MusicGroupDao.BasicUserDto">
         select su.id_ user_id_,su.username_,su.phone_,s.name_ subject_name_ from student_registration sr 
         LEFT JOIN sys_user su ON su.id_ = sr.user_id_
-        LEFT JOIN `subject` s ON s.id_ = sr.subject_id_
+        LEFT JOIN `subject` s ON s.id_ = sr.actual_subject_id_
         where sr.music_group_id_ = #{musicGroupId} AND sr.music_group_status_ = 'NORMAL' AND sr.user_id_ NOT IN (
         SELECT DISTINCT mgpcd.user_id_ FROM music_group_payment_calender_detail mgpcd left join music_group_payment_calender mgpc on mgpcd.music_group_payment_calender_id_ = mgpc.id_
         WHERE mgpc.batch_no_ = #{batchNo} and mgpc.music_group_id_ = #{musicGroupId}
@@ -788,7 +788,7 @@
             AND (sr.user_id_ = #{search} OR su.username_ LIKE CONCAT('%',#{search},'%'))
         </if>
         <if test="subjectId != null">
-            AND sr.subject_id_ = #{subjectId}
+            AND sr.actual_subject_id_ = #{subjectId}
         </if>
     </select>