diff --git a/db/migrate/20191204030230_migrate_exercise_single_question_score.rb b/db/migrate/20191204030230_migrate_exercise_single_question_score.rb
index 1238e25f1..fcc608bb5 100644
--- a/db/migrate/20191204030230_migrate_exercise_single_question_score.rb
+++ b/db/migrate/20191204030230_migrate_exercise_single_question_score.rb
@@ -1,27 +1,27 @@
 class MigrateExerciseSingleQuestionScore < ActiveRecord::Migration[5.2]
   def change
-    # 删除判断、单选题中生成多条记录，但exercise_choice_id不同的数据
-    sql = %Q(delete from exercise_answers where (exercise_question_id, user_id) in
-            (select * from (select exercise_question_id, user_id from exercise_answers join exercise_questions eq on exercise_question_id = eq.id where eq.question_type in (0, 2) group by exercise_question_id, user_id having count(*) > 1) a)
-            and id not in (select * from (select min(exercise_answers.id) from exercise_answers join exercise_questions eq on exercise_question_id = eq.id where eq.question_type in (0, 2) group by exercise_question_id, user_id having count(*) > 1 order by exercise_answers.id) b))
-    ActiveRecord::Base.connection.execute sql
-
-    # 更新成绩
-    exercise_answers = ExerciseAnswer.joins(:exercise_question).where(score: -1, exercise_questions: {question_type: [0, 2]})
-    exercise_answers.includes(:exercise_choice, exercise_question: :exercise_standard_answers).find_each do |answer|
-
-      question = answer.exercise_question
-      exercise_user = ExerciseUser.find_by(exercise_id: question.exercise_id, user_id: answer.user_id)
-
-      if exercise_user && exercise_user.commit_status == 1
-        user_choice_position = answer.exercise_choice&.choice_position
-        if user_choice_position && (user_choice_position.to_i == question.exercise_standard_answers.take&.exercise_choice_id.to_i)
-          answer.update!(score: question.question_score)
-          score = exercise_user.score.to_f + question.question_score
-          objective_score = exercise_user.objective_score + question.question_score
-          exercise_user.update!(score: score, objective_score: objective_score)
-        end
-      end
-    end
+    # # 删除判断、单选题中生成多条记录，但exercise_choice_id不同的数据
+    # sql = %Q(delete from exercise_answers where (exercise_question_id, user_id) in
+    #         (select * from (select exercise_question_id, user_id from exercise_answers join exercise_questions eq on exercise_question_id = eq.id where eq.question_type in (0, 2) group by exercise_question_id, user_id having count(*) > 1) a)
+    #         and id not in (select * from (select min(exercise_answers.id) from exercise_answers join exercise_questions eq on exercise_question_id = eq.id where eq.question_type in (0, 2) group by exercise_question_id, user_id having count(*) > 1 order by exercise_answers.id) b))
+    # ActiveRecord::Base.connection.execute sql
+    #
+    # # 更新成绩
+    # exercise_answers = ExerciseAnswer.joins(:exercise_question).where(score: -1, exercise_questions: {question_type: [0, 2]})
+    # exercise_answers.includes(:exercise_choice, exercise_question: :exercise_standard_answers).find_each do |answer|
+    #
+    #   question = answer.exercise_question
+    #   exercise_user = ExerciseUser.find_by(exercise_id: question.exercise_id, user_id: answer.user_id)
+    #
+    #   if exercise_user && exercise_user.commit_status == 1
+    #     user_choice_position = answer.exercise_choice&.choice_position
+    #     if user_choice_position && (user_choice_position.to_i == question.exercise_standard_answers.take&.exercise_choice_id.to_i)
+    #       answer.update!(score: question.question_score)
+    #       score = exercise_user.score.to_f + question.question_score
+    #       objective_score = exercise_user.objective_score + question.question_score
+    #       exercise_user.update!(score: score, objective_score: objective_score)
+    #     end
+    #   end
+    # end
   end
 end