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こんにちは、12 か月前の時間枠で月ごとに発生したドライブを取得する次のクエリがあります。ただし、結果は正しくありません。たとえば、テスト データベースでは 2 月に発生したドライブは 3 つしかありませんが、結果セットでは 9 つのドライブが表示されます。

SELECT mlist.m, count(data.month) as drvs
                     FROM users, (
                           SELECT 'Jan' AS m
                           UNION SELECT 'Feb' AS m
                           UNION SELECT 'Mar' AS m
                           UNION SELECT 'Apr' AS m
                           UNION SELECT 'May' AS m
                           UNION SELECT 'Jun' AS m
                           UNION SELECT 'Jul' AS m
                           UNION SELECT 'Aug' AS m
                           UNION SELECT 'Sep' AS m
                           UNION SELECT 'Oct' AS m
                           UNION SELECT 'Nov' AS m
                           UNION SELECT 'Dec' AS m
                          ) AS mlist LEFT JOIN (SELECT DATE_FORMAT(drives.timestamp, '%b') AS month,
                                 drives.timestamp,
                                 CONCAT(drivers.name, ' ', drivers.surname) as driver,
                                 drivers.id as driver_id
                                 FROM drives, drivers WHERE drives.user = '146'
                                 AND drives.timestamp > DATE_SUB(now(), INTERVAL 12 MONTH)) data
                ON mlist.m = data.month GROUP BY mlist.m

結果：

"4月","3" "8月","3" "12月","6" "2月","9" "1月","3" "7月","3" "6月","3" " 3月","3" "5月","3" "11月","3" "10月","6" "9月","3"

4

1 に答える 1

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これはうまくいきました：

SELECT  mlist.m, count(data.drive_id) AS drvs
                     FROM users, (
                           SELECT 'Jan' AS m
                           UNION SELECT 'Feb' AS m
                           UNION SELECT 'Mar' AS m
                           UNION SELECT 'Apr' AS m
                           UNION SELECT 'May' AS m
                           UNION SELECT 'Jun' AS m
                           UNION SELECT 'Jul' AS m
                           UNION SELECT 'Aug' AS m
                           UNION SELECT 'Sep' AS m
                           UNION SELECT 'Oct' AS m
                           UNION SELECT 'Nov' AS m
                           UNION SELECT 'Dec' AS m
                          ) AS mlist LEFT JOIN (SELECT DATE_FORMAT(drives.timestamp, '%b') AS month,
                                 drives.id AS drive_id, 
                                 drives.timestamp
                                 FROM drives WHERE drives.user = '146'
                                 AND drives.timestamp > DATE_SUB(now(), INTERVAL 12 MONTH)) data
                ON mlist.m = data.month GROUP BY mlist.m
于 2013-11-05T19:05:19.213 に答える