根據2個條件選擇行

Question

我有2張桌子，記錄：

CREATE TABLE IF NOT EXISTS `records` (
`recordid` int(11) NOT NULL AUTO_INCREMENT,
`userid` int(11) NOT NULL,
`platform` varchar(255) NOT NULL,
`track` varchar(255) NOT NULL,
`trackid` int(11) NOT NULL,
`bike` varchar(255) NOT NULL,
`time` decimal(7,3) NOT NULL,
`faults` int(11) NOT NULL,
`date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`verified` varchar(3) NOT NULL DEFAULT 'no',
`wr` varchar(3) NOT NULL DEFAULT 'no',
PRIMARY KEY (`recordid`),
KEY `userid` (`userid`)
)

和用戶：

CREATE TABLE IF NOT EXISTS `users` (
`userid` int(11) NOT NULL AUTO_INCREMENT,
`email` varchar(255) NOT NULL,
`username` varchar(255) NOT NULL,
`password` varchar(255) NOT NULL,
`country` varchar(50) NOT NULL,
`verified` varchar(3) NOT NULL DEFAULT 'no',
PRIMARY KEY (`userid`)
) 

我存儲了一些示例數據：

 +----------+--------+----------+----------------+---------+-----------+---------+--------+---------------------+----------+-----+
| recordid | userid | platform |     track      | trackid |   bike    |  time   | faults |        date         | verified | wr  |
+----------+--------+----------+----------------+---------+-----------+---------+--------+---------------------+----------+-----+
|      412 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 90.456  |      6 | 2017-02-18 19:54:27 | yes      | yes |
|      413 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 75.458  |      4 | 2017-02-18 19:54:39 | yes      | yes |
|      414 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 77.885  |      2 | 2017-02-18 19:55:02 | yes      | yes |
|      415 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 59.441  |      1 | 2017-02-18 19:55:12 | yes      | yes |
|      416 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 52.145  |      0 | 2017-02-18 19:55:21 | yes      | yes |
|      417 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 48.444  |      0 | 2017-02-18 19:55:26 | yes      | yes |
|      418 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 42.753  |      0 | 2017-02-18 19:55:33 | yes      | yes |
|      419 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 39.701  |      0 | 2017-02-18 19:55:42 | yes      | yes |
|      420 |      1 | Xbox     | Inferno IV     |      40 | Pit Viper | 745.159 |    254 | 2017-02-18 20:17:35 | yes      | yes |
|      421 |      1 | Xbox     | Inferno IV     |      40 | Pit Viper | 575.169 |    128 | 2017-02-18 20:17:50 | yes      | yes |
|      422 |      1 | Xbox     | Inferno IV     |      40 | Pit Viper | 465.456 |    101 | 2017-02-18 20:18:12 | yes      | yes |
|      423 |      1 | Xbox     | Inferno IV     |      40 | Pit Viper | 321.247 |     75 | 2017-02-18 20:18:29 | yes      | yes |
|      424 |      1 | Xbox     | Inferno IV     |      40 | Pit Viper | 236.456 |     35 | 2017-02-18 20:18:58 | yes      | yes |
|      425 |      1 | Xbox     | Inferno IV     |      40 | Pit Viper | 165.359 |     25 | 2017-02-18 20:19:17 | yes      | yes |
|      426 |      1 | Xbox     | Waterworks     |       2 | Pit Viper | 45.452  |    457 | 2017-02-18 23:13:12 | yes      | yes |
|      427 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 34.123  |      0 | 2017-02-18 23:21:47 | yes      | yes |
|      428 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 32.254  |      0 | 2017-02-18 23:24:32 | yes      | yes |
|      429 |      1 | Xbox     | Turbine Terror |       1 | Pit Viper | 31.169  |      0 | 2017-02-18 23:25:33 | yes      | yes |
|      430 |      1 | Xbox     | Waterworks     |       2 | Pit Viper | 50.000  |      0 | 2017-02-20 20:06:23 | yes      | yes |
|      431 |      3 | Xbox     | Turbine Terror |       1 | Pit Viper | 25.123  |      0 | 2017-02-20 20:21:54 | no       | yes |
+----------+--------+----------+----------------+---------+-----------+---------+--------+---------------------+----------+-----+

我在開發中有一個查詢：

SELECT users.username, 
       records.platform, 
       records.track, 
       records.bike,  
       records.time, 
       records.faults, 
       records.date 
FROM records 
INNER JOIN users 
   ON records.userid = users.userid 
INNER JOIN (SELECT track, time, MIN(faults) AS faults 
            FROM records GROUP BY track) AS tracksWithMinFaults 
   ON records.track = tracksWithMinFaults.track 
  AND records.faults = tracksWithMinFaults.faults 
WHERE users.userid = 1  
ORDER BY records.trackid ASC

對以上數據集的查詢結果：

+----------------+----------+----------------+-----------+---------+--------+---------------------+
|    username    | platform |     track      |   bike    |  time   | faults |        date         |
+----------------+----------+----------------+-----------+---------+--------+---------------------+
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 52.145  |      0 | 2017-02-18 19:55:21 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 48.444  |      0 | 2017-02-18 19:55:26 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 42.753  |      0 | 2017-02-18 19:55:33 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 39.701  |      0 | 2017-02-18 19:55:42 |
| TheRealTeeHill | Xbox     | Inferno IV     | Pit Viper | 165.359 |     25 | 2017-02-18 20:19:17 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 34.123  |      0 | 2017-02-18 23:21:47 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 32.254  |      0 | 2017-02-18 23:24:32 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 31.169  |      0 | 2017-02-18 23:25:33 |
| TheRealTeeHill | Xbox     | Waterworks     | Pit Viper | 50.000  |      0 | 2017-02-20 20:06:23 |
+----------------+----------+----------------+-----------+---------+--------+---------------------+

一些背景知識：我正在嘗試為給定用戶ID的每條曲目提取“最佳”記錄。 最佳記錄可以定義為故障最少，時間最少的記錄。 到目前為止，我開發的查詢正在拉取故障最少的用戶的所有記錄。 查詢尚未考慮時間！

我的問題：如何找到故障最少的每個軌道的最短時間？

這是我在StackOverflow上的第一篇文章，如果我錯過了任何事情或做錯了什么，請告訴我。 在此先感謝您的時間 ：）

編輯：我正在尋找2個最小值時，在建議的重復帖子中看不到解決方案，首先我需要提取查詢所執行的所有最低故障記錄，然后從中提取最低時間記錄組？ 如果解決方案在其他帖子中，我看不到:(

這是我想要達到的結果：

+----------------+----------+----------------+-----------+---------+--------+---------------------+
|    username    | platform |     track      |   bike    |  time   | faults |        date         |
+----------------+----------+----------------+-----------+---------+--------+---------------------+
| TheRealTeeHill | Xbox     | Inferno IV     | Pit Viper | 165.359 |     25 | 2017-02-18 20:19:17 |
| TheRealTeeHill | Xbox     | Turbine Terror | Pit Viper | 31.169  |      0 | 2017-02-18 23:25:33 |
| TheRealTeeHill | Xbox     | Waterworks     | Pit Viper | 50.000  |      0 | 2017-02-20 20:06:23 |
+----------------+----------+----------------+-----------+---------+--------+---------------------+

Answer 1

使用變量為每個音軌創建一個row_number ，但是在這里我看到您可能對紐帶有疑問。 不確定如何處理這些問題。

DEMO

SELECT *
FROM (
        SELECT records.userid, 
               records.platform, 
               records.track, 
               records.bike,  
               records.time, 
               records.faults, 
               records.date,
               @row := IF( @track = records.track, 
                           @row + 1,
                           IF(@track := records.track, 1, 1)
                         ) as rn
        FROM records 
        CROSS JOIN (SELECT @row := 0, @track := '') as par
        WHERE records.userid = 1
        ORDER BY records.trackid ASC,
                 records.faults ASC,
                 records.time ASC
     ) as T
WHERE T.rn = 1;     

OUTPUT

Answer 2

嘗試這個

   SELECT 
         users.name,records.platform,records.track,records.min_time,records.bike,records.time,records.min_faults,records.date  
   FROM users 
   INNER JOIN 
   (SELECT MIN(time) as min_time,time, MIN(faults) AS min_faults,faults,platform,track,bike,date   FROM records GROUP BY trackid) records 
   ON records.time = records.min_time  
   AND records.faults = records.min_faults  
   AND records.recordid = users.userid  
   WHERE users.userid = 1    
   ORDER BY records.trackid ASC;