diff --git a/app/controllers/courses_controller.rb b/app/controllers/courses_controller.rb
index 087b31664..45a3f981b 100644
--- a/app/controllers/courses_controller.rb
+++ b/app/controllers/courses_controller.rb
@@ -1284,18 +1284,18 @@ class CoursesController < ApplicationController
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{@course.id}
           AND student_works.user_id = members.user_id
-        ) AS score,(SELECT (message_num*2 + message_reply_num*1 + news_reply_num*1 + news_num*1 +
+        ) AS score,(SELECT max(message_num*2 + message_reply_num*1 + news_reply_num*1 + news_num*1 +
          resource_num*5 + journal_num*1 + homework_journal_num*1 ) FROM `course_contributor_scores` AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id
         ) AS act_score,(SELECT SUM(exercise_users.score) FROM exercise_users,exercises WHERE exercise_users.exercise_id = exercises.id
         AND exercises.course_id = #{@course.id} AND exercise_users.user_id = members.user_id) AS ex_score,
-        (SELECT student_id FROM user_extensions WHERE user_extensions.user_id = members.user_id) AS student_id,
-        (SELECT message_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_num,
-        (SELECT message_reply_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_reply_num,
-        (SELECT news_reply_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_reply_num,
-        (SELECT news_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_num,
-        (SELECT resource_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS resource_num,
-        (SELECT journal_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS journal_num,
-        (SELECT homework_journal_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS homework_journal_num,
+        (SELECT max(student_id) FROM user_extensions WHERE user_extensions.user_id = members.user_id) AS student_id,
+        (SELECT max(message_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_num,
+        (SELECT max(message_reply_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_reply_num,
+        (SELECT max(news_reply_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_reply_num,
+        (SELECT max(news_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_num,
+        (SELECT max(resource_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS resource_num,
+        (SELECT max(journal_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS journal_num,
+        (SELECT max(homework_journal_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS homework_journal_num,
         (SELECT COUNT(ss.id) FROM student_works AS ss ,homework_commons AS hc WHERE ss.homework_common_id = hc.id AND hc.course_id = #{@course.id} AND ss.work_status != 0 AND ss.user_id = members.user_id) AS homework_num,
         (SELECT COUNT(eu.id) FROM exercise_users AS eu,exercises WHERE eu.exercise_id = exercises.id AND exercises.course_id = #{@course.id} AND exercises.end_time >= eu.created_at AND eu.user_id = members.user_id) AS exercise_num
         FROM members
@@ -1309,18 +1309,18 @@ class CoursesController < ApplicationController
           WHERE student_works.homework_common_id = homework_commons.id
           AND homework_commons.course_id = #{@course.id}
           AND student_works.user_id = members.user_id
-        ) AS score,(SELECT (message_num*2 + message_reply_num*1 + news_reply_num*1 + news_num*1 +
+        ) AS score,(SELECT max(message_num*2 + message_reply_num*1 + news_reply_num*1 + news_num*1 +
          resource_num*5 + journal_num*1 + homework_journal_num*1 ) FROM `course_contributor_scores` AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id
         ) AS act_score,(SELECT SUM(exercise_users.score) FROM exercise_users,exercises WHERE exercise_users.exercise_id = exercises.id
         AND exercises.course_id = #{@course.id} AND exercise_users.user_id = members.user_id) AS ex_score,
-        (SELECT student_id FROM user_extensions WHERE user_extensions.user_id = members.user_id) AS student_id,
-        (SELECT message_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_num,
-        (SELECT message_reply_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_reply_num,
-        (SELECT news_reply_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_reply_num,
-        (SELECT news_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_num,
-        (SELECT resource_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS resource_num,
-        (SELECT journal_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS journal_num,
-        (SELECT homework_journal_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS homework_journal_num,
+        (SELECT max(student_id) FROM user_extensions WHERE user_extensions.user_id = members.user_id) AS student_id,
+        (SELECT max(message_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_num,
+        (SELECT max(message_reply_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_reply_num,
+        (SELECT max(news_reply_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_reply_num,
+        (SELECT max(news_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_num,
+        (SELECT max(resource_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS resource_num,
+        (SELECT max(journal_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS journal_num,
+        (SELECT max(homework_journal_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS homework_journal_num,
         (SELECT COUNT(ss.id) FROM student_works AS ss ,homework_commons AS hc WHERE ss.homework_common_id = hc.id AND hc.course_id = #{@course.id} AND ss.work_status != 0 AND ss.user_id = members.user_id) AS homework_num,
         (SELECT COUNT(eu.id) FROM exercise_users AS eu,exercises WHERE eu.exercise_id = exercises.id AND exercises.course_id = #{@course.id} AND exercises.end_time >= eu.created_at AND eu.user_id = members.user_id) AS exercise_num
         FROM members
@@ -1338,14 +1338,14 @@ class CoursesController < ApplicationController
          resource_num*5 + journal_num*1 + homework_journal_num*1 ) FROM `course_contributor_scores` AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id
         ) AS act_score,(SELECT SUM(exercise_users.score) FROM exercise_users,exercises WHERE exercise_users.exercise_id = exercises.id
         AND exercises.course_id = #{@course.id} AND exercise_users.user_id = members.user_id) AS ex_score,
-        (SELECT student_id FROM user_extensions WHERE user_extensions.user_id = members.user_id) AS student_id,
-        (SELECT message_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_num,
-        (SELECT message_reply_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_reply_num,
-        (SELECT news_reply_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_reply_num,
-        (SELECT news_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_num,
-        (SELECT resource_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS resource_num,
-        (SELECT journal_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS journal_num,
-        (SELECT homework_journal_num FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS homework_journal_num,
+        (SELECT max(student_id) FROM user_extensions WHERE user_extensions.user_id = members.user_id) AS student_id,
+        (SELECT max(message_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_num,
+        (SELECT max(message_reply_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS message_reply_num,
+        (SELECT max(news_reply_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_reply_num,
+        (SELECT max(news_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS news_num,
+        (SELECT max(resource_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS resource_num,
+        (SELECT max(journal_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS journal_num,
+        (SELECT max(homework_journal_num) FROM course_contributor_scores AS ccs WHERE ccs.course_id = #{@course.id} AND ccs.user_id = members.user_id) AS homework_journal_num,
         (SELECT COUNT(ss.id) FROM student_works AS ss ,homework_commons AS hc WHERE ss.homework_common_id = hc.id AND hc.course_id = #{@course.id} AND ss.work_status != 0 AND ss.user_id = members.user_id) AS homework_num,
         (SELECT COUNT(eu.id) FROM exercise_users AS eu,exercises WHERE eu.exercise_id = exercises.id AND exercises.course_id = #{@course.id} AND exercises.end_time >= eu.created_at AND eu.user_id = members.user_id) AS exercise_num
         FROM members