fix

zhongzheng-system/src/main/resources/mapper/modules/grade/ClassGradeUserMapper.xml

@@ -203,7 +203,7 @@
         LEFT JOIN class_grade cg ON cg.grade_id = g.grade_id
         WHERE
         1 = 1
-
+          AND g.change_grade = 0
         AND g.grade_id = #{gradeId}
         AND g.user_id = #{userId}