删除重复记录

db/migrate/20191204030230_migrate_exercise_single_question_score.rb

@@ -7,7 +7,7 @@ class MigrateExerciseSingleQuestionScore < ActiveRecord::Migration[5.2]
     ActiveRecord::Base.connection.execute sql
 
     # 更新成绩
-    exercise_answers = ExerciseAnswer.joins(:exercise_question).where("exercise_answers.created_at > '2019-11-01 00:00:00'").where(score: -1, exercise_questions: {question_type: [0, 2]})
+    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

db/migrate/20191204062733_add_temp_migration.rb

@@ -1,10 +0,0 @@
-class AddTempMigration < 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
-
-  end
-end

db/migrate/20191204063225_add_exercise_temp_migration.rb

@@ -1,10 +0,0 @@
-class AddExerciseTempMigration < 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
-
-  end
-end