23

1 時間ごとの使用状況で、履歴テーブルからレポートを取得しようとしています。historyテーブルは;

CREATE TABLE IF NOT EXISTS `history` (
`history_id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`user_id` int(11) unsigned NOT NULL DEFAULT '0',
`created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`history_id`),
KEY `user_id` (`user_id`),
KEY `created` (`created`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1 ;

特定の日付範囲内のすべてのレコードでグループ化HOURしたい。COUNT

Hours            |    Usage
------------------------------------
00:00-01:00      |      5
01:00-02:00      |      9
02:00-03:00      |      0 (or NULL)
03:00-04:00      |      20
...
...
...
22:00-23:00      |      11
23:00-00:00      |      1

このようなクエリを使用しましたが、すべての時間を表示するわけではありません。

SELECT 

CASE 
  WHEN HOUR(created) BETWEEN 0 AND 1 THEN '00:00 - 01:00'
  WHEN HOUR(created) BETWEEN 1 AND 2 THEN '01:00 - 02:00'
  WHEN HOUR(created) BETWEEN 2 AND 3 THEN '02:00 - 03:00'
  WHEN HOUR(created) BETWEEN 3 AND 4 THEN '03:00 - 04:00'
  WHEN HOUR(created) BETWEEN 4 AND 5 THEN '04:00 - 05:00'
  WHEN HOUR(created) BETWEEN 5 AND 6 THEN '05:00 - 06:00'
  WHEN HOUR(created) BETWEEN 6 AND 7 THEN '06:00 - 07:00'
  WHEN HOUR(created) BETWEEN 7 AND 8 THEN '07:00 - 08:00'
  WHEN HOUR(created) BETWEEN 8 AND 9 THEN '08:00 - 09:00'
  WHEN HOUR(created) BETWEEN 9 AND 10 THEN '09:00 - 10:00'
  WHEN HOUR(created) BETWEEN 10 AND 11 THEN '10:00 - 11:00'
  WHEN HOUR(created) BETWEEN 11 AND 12 THEN '11:00 - 12:00'
  WHEN HOUR(created) BETWEEN 12 AND 13 THEN '12:00 - 13:00'
  WHEN HOUR(created) BETWEEN 13 AND 14 THEN '13:00 - 14:00'
  WHEN HOUR(created) BETWEEN 14 AND 15 THEN '14:00 - 15:00'
  WHEN HOUR(created) BETWEEN 15 AND 16 THEN '15:00 - 16:00'
  WHEN HOUR(created) BETWEEN 16 AND 17 THEN '16:00 - 17:00'
  WHEN HOUR(created) BETWEEN 17 AND 18 THEN '17:00 - 18:00'
  WHEN HOUR(created) BETWEEN 18 AND 19 THEN '18:00 - 19:00'
  WHEN HOUR(created) BETWEEN 19 AND 20 THEN '19:00 - 20:00'
  WHEN HOUR(created) BETWEEN 20 AND 21 THEN '20:00 - 21:00'
  WHEN HOUR(created) BETWEEN 21 AND 22 THEN '21:00 - 23:00'
  WHEN HOUR(created) BETWEEN 22 AND 23 THEN '22:00 - 23:00'
  WHEN HOUR(created) BETWEEN 23 AND 24 THEN '23:00 - 00:00'
END AS `Hours`,

COUNT(*) AS `usage`
FROM history
WHERE (created BETWEEN '2012-02-07' AND NOW())
GROUP BY 
  CASE 
    WHEN HOUR(created) BETWEEN 0 AND 1 THEN 1
    WHEN HOUR(created) BETWEEN 1 AND 2 THEN 2
    WHEN HOUR(created) BETWEEN 2 AND 3 THEN 3
    WHEN HOUR(created) BETWEEN 3 AND 4 THEN 4
    WHEN HOUR(created) BETWEEN 4 AND 5 THEN 5
    WHEN HOUR(created) BETWEEN 5 AND 6 THEN 6
    WHEN HOUR(created) BETWEEN 6 AND 7 THEN 7
    WHEN HOUR(created) BETWEEN 7 AND 8 THEN 8
    WHEN HOUR(created) BETWEEN 8 AND 9 THEN 9
    WHEN HOUR(created) BETWEEN 9 AND 10 THEN 10
    WHEN HOUR(created) BETWEEN 10 AND 11 THEN 11
    WHEN HOUR(created) BETWEEN 11 AND 12 THEN 12
    WHEN HOUR(created) BETWEEN 12 AND 13 THEN 13
    WHEN HOUR(created) BETWEEN 13 AND 14 THEN 14
    WHEN HOUR(created) BETWEEN 14 AND 15 THEN 15
    WHEN HOUR(created) BETWEEN 15 AND 16 THEN 16
    WHEN HOUR(created) BETWEEN 16 AND 17 THEN 17
    WHEN HOUR(created) BETWEEN 17 AND 18 THEN 18
    WHEN HOUR(created) BETWEEN 18 AND 19 THEN 19
    WHEN HOUR(created) BETWEEN 19 AND 20 THEN 20
    WHEN HOUR(created) BETWEEN 20 AND 21 THEN 21
    WHEN HOUR(created) BETWEEN 21 AND 22 THEN 22
    WHEN HOUR(created) BETWEEN 22 AND 23 THEN 23
    WHEN HOUR(created) BETWEEN 23 AND 24 THEN 24
END

レコードがある場合にのみ表示されます。

Hours            |    Usage
------------------------------------
00:00-01:00      |      5
01:00-02:00      |      9
23:00-00:00      |      1
4

4 に答える 4

36

既存のクエリは次のように減らすことができます。

SELECT   CONCAT(HOUR(created), ':00-', HOUR(created)+1, ':00') AS Hours
  ,      COUNT(*) AS `usage`
FROM     history
WHERE    created BETWEEN '2012-02-07' AND NOW()
GROUP BY HOUR(created)

データがない時間を含めて1時間ごとに表示するには、データが必要なすべての時間を含むテーブルと外部結合する必要があります。次を使用して、クエリでこのようなテーブルを作成できますUNION。

SELECT   CONCAT(Hour, ':00-', Hour+1, ':00') AS Hours
  ,      COUNT(created) AS `usage`
FROM     history
  RIGHT JOIN (
                   SELECT  0 AS Hour
         UNION ALL SELECT  1 UNION ALL SELECT  2 UNION ALL SELECT  3
         UNION ALL SELECT  4 UNION ALL SELECT  5 UNION ALL SELECT  6
         UNION ALL SELECT  7 UNION ALL SELECT  8 UNION ALL SELECT  9
         UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL SELECT 12
         UNION ALL SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15
         UNION ALL SELECT 16 UNION ALL SELECT 17 UNION ALL SELECT 18
         UNION ALL SELECT 19 UNION ALL SELECT 20 UNION ALL SELECT 21
         UNION ALL SELECT 22 UNION ALL SELECT 23
  )      AS AllHours ON HOUR(created) = Hour
WHERE    created BETWEEN '2012-02-07' AND NOW() OR created IS NULL
GROUP BY Hour
ORDER BY Hour

ただし、データが存在しないグループの処理は、データベース自体ではなくデータアクセス層に配置するのが最適なビジネスロジックの問題です。実際、アプリケーションが1時間ごとにゼロ値を使用するのは簡単なことです。不在。

于 2012-05-03T10:36:52.817 に答える
0

Prashanth の応答に基づいて、Hour があいまいであるという警告を受け取りました (Percona 5.7)。また、正しい順序で結果が得られませんでした。以下はこれらの問題を解決し、GROUP BY および ORDER BY 句に関してより明確です。

SELECT
  dayname(date_sub(curdate(), INTERVAL 1 DAY)) AS Day,
  CONCAT(Hour, ':00-', Hour+1, ':00') AS Hour,
  COUNT(created_at) AS `total`
FROM logtable
RIGHT JOIN
  (
     SELECT  0 AS Hour
     UNION ALL SELECT  1 UNION ALL SELECT  2 UNION ALL SELECT  3
     UNION ALL SELECT  4 UNION ALL SELECT  5 UNION ALL SELECT  6
     UNION ALL SELECT  7 UNION ALL SELECT  8 UNION ALL SELECT  9
     UNION ALL SELECT 10 UNION ALL SELECT 11 UNION ALL SELECT 12
     UNION ALL SELECT 13 UNION ALL SELECT 14 UNION ALL SELECT 15
     UNION ALL SELECT 16 UNION ALL SELECT 17 UNION ALL SELECT 18
     UNION ALL SELECT 19 UNION ALL SELECT 20 UNION ALL SELECT 21
     UNION ALL SELECT 22 UNION ALL SELECT 23
  )
  AS totalhours
  ON ( HOUR(created_at) = HOUR
  AND DATE(created_at) = date_sub(curdate(), INTERVAL 1 DAY) )
  OR created_at IS NULL
GROUP BY
   CONCAT(Hour, ':00-', Hour+1, ':00')
ORDER BY
   totalhours.Hour;
于 2021-06-30T21:09:43.593 に答える