学生乐团增加退团时间

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

@@ -166,8 +166,8 @@
 
     <select id="findByMusicGroupUserSubject" resultType="map">
         SELECT
-            sr.user_id_ AS 'key',
-            s.name_ AS 'value'
+            sr.user_id_ AS `key`,
+            s.name_ AS `value`
         FROM
             student_registration sr
             LEFT JOIN `subject` s ON sr.actual_subject_id_=s.id_