update 时间差列表的排序、统计

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

@@ -1461,7 +1461,7 @@
     </select>
 
     <select id="getRegisterNum" resultType="int">
-        SELECT * FROM student_registration WHERE music_group_id_ = #{musicGroupId} AND music_group_status_ != 'QUIT'
+        SELECT COUNT(*) FROM student_registration WHERE music_group_id_ = #{musicGroupId} AND music_group_status_ != 'QUIT'
     </select>
 
     <select id="getFirstPayNum" resultType="int">