-- 4.1.1 ユーザーの評価回数平均 --
td query -w -d book_crossing_dataset "
SELECT ROUND(AVG(cnt)) AS avg
FROM
(
  SELECT user_id, COUNT(book_rating) AS cnt
  FROM ratings
  GROUP BY user_id
) t1
"

-- 4.1.2 ユーザーの評価回数分布 --
td query -w -d book_crossing_dataset -f csv -o review_user_dist_of_review_count.csv "
SELECT cnt, user_cnt, ROUND(user_cnt/total_user_cnt*1000)/10 AS rate
FROM
(
  SELECT cnt, COUNT(*) AS user_cnt, 1 AS one
  FROM
  (
    SELECT user_id, COUNT(book_rating) AS cnt
    FROM ratings
    GROUP BY user_id
  ) t1
  GROUP BY cnt
  ORDER BY cnt
  LIMIT 50
) o1
JOIN
(
  SELECT COUNT(distinct user_id) AS total_user_cnt, 1 AS one
  FROM ratings
) o2
ON
(o1.one=o2.one)
"

-- 4.2 ユーザーの評価平均分布 (0<book_rating, 5<=count(book_rating)) --
td query -w -d book_crossing_dataset -f csv -o review_user_dist_of_review_avg.csv "
SELECT avg, COUNT(*)
FROM
(
  SELECT user_id, ROUND(AVG(book_rating)/0.5)*0.5 AS avg, COUNT(book_rating) AS cnt
  FROM ratings
  WHERE 0 < book_rating
  GROUP BY user_id
  HAVING 5 <= COUNT(book_rating)
) t1
GROUP BY avg
ORDER BY avg
"

-- 4.３ ユーザーの年代別×評価平均分布 (0<book_rating, 5<=count(book_rating)) --
td query -w -d book_crossing_dataset -f csv -o review_user_dist_of_review_avg_by_generation.csv "
SELECT o1.generation, avg, ROUND(cnt/total_cnt*1000)/10 AS rate
FROM
(
  SELECT generation, avg, COUNT(*) AS cnt
  FROM
  (
    SELECT user_id, ROUND(AVG(book_rating)/0.5)*0.5 AS avg, COUNT(book_rating) AS cnt
    FROM ratings
    WHERE 0 < book_rating
    GROUP BY user_id
    HAVING 5 <= COUNT(book_rating)
  ) t1
  JOIN
  (
    SELECT user_id, CEIL(IF(age='NULL',0,CAST(age AS INT))/5)*5 AS generation
    FROM users
    WHERE 10 < IF(age='NULL',0,CAST(age AS INT))
    AND IF(age='NULL',0,CAST(age AS INT)) <= 65
  ) t2
  ON
  (t1.user_id=t2.user_id)
  GROUP BY generation,avg
) o1
JOIN
(
  SELECT generation, COUNT(*) AS total_cnt
  FROM
  (
    SELECT user_id, COUNT(book_rating)
    FROM ratings
    WHERE 0 < book_rating
    GROUP BY user_id
    HAVING 5 <= COUNT(book_rating)
  ) t1
  JOIN
  (
    SELECT user_id, CEIL(IF(age='NULL',0,CAST(age AS INT))/5)*5 AS generation
    FROM users
    WHERE 10 < IF(age='NULL',0,CAST(age AS INT))
    AND IF(age='NULL',0,CAST(age AS INT)) <= 65
  ) t2
  ON
  (t1.user_id=t2.user_id)
  GROUP BY generation
) o2
ON
(o1.generation=o2.generation)
ORDER BY generation, avg
"