根据同一个 mysql 表中的 id 添加点列
好的,数据库的布局如下(仅列出正在使用的列):
Table Name: race_stats
Columns: race_id, user_id, points, tournament_id
Table Name: user
Columns: user_id, driver
Table Name: race
Columns: race_id, race_name
Table Name: tournament
Columns: tournament_id, tournament_name
这是我当前的查询:
$query = "
SELECT user.user_id, user.driver, race_stats.points, race_stats.user_id,
SUM(race_stats.points) AS total_points "."
FROM user, race_stats, tournament, race "."
WHERE race.race_id=race_stats.race_id
AND user.user_id=race_stats.user_id
AND tournament.tournament_id=race_stats.tournament_id
GROUP BY driver
ORDER BY total_points DESC
LIMIT 0, 15
";
好的,查询有效,但它将 race_stats.race_id 列中所有可用比赛的所有比赛加起来作为总分。我已经绞尽脑汁来解决这个问题,但我似乎找不到我需要的解决方案。我确信这一定是一个简单的修复,但我就是无法得到它。非常感谢任何帮助。
///////////////////用原始值编辑
INSERT INTO `race_stats` (`id_race`, `race_id`, `user_id`, `f`, `s`, `race_interval`, `race_laps`, `led`, `points`, `total_points`, `race_status`, `tournament_id`, `driver`, `tournament_name`) VALUES
(1, 1, 4, 1, 4, '135.878', 60, '2', 180, 0, 'Running', 1, 'new_driver_5', ''),
(2, 1, 2, 2, 2, '-0.08', 60, '22', 175, 0, 'Running', 1, 'new_driver_38', ''),
(3, 1, 5, 3, 5, '-11.82', 60, '2', 170, 0, 'Running', 1, 'new_driver_94', ''),
(4, 2, 2, 1, 15, '138.691', 29, '6', 180, 0, 'Running', 2, 'new_driver_38', ''),
(5, 2, 15, 2, 9, '-16.12', 29, '8*', 180, 0, 'Running', 2, 'new_driver_44', ''),
(6, 2, 8, 3, 11, '-2:03.48', 29, '0', 165, 0, 'Running', 2, 'new_driver_83', ''),
//////////////////////////////////////////////////////////////////////////就是你所说的原始值的意思,如果不是的话我可以为你获取更多数据。
OK the database is layed out as (only columns being used are listed):
Table Name: race_stats
Columns: race_id, user_id, points, tournament_id
Table Name: user
Columns: user_id, driver
Table Name: race
Columns: race_id, race_name
Table Name: tournament
Columns: tournament_id, tournament_name
This is my current query:
$query = "
SELECT user.user_id, user.driver, race_stats.points, race_stats.user_id,
SUM(race_stats.points) AS total_points "."
FROM user, race_stats, tournament, race "."
WHERE race.race_id=race_stats.race_id
AND user.user_id=race_stats.user_id
AND tournament.tournament_id=race_stats.tournament_id
GROUP BY driver
ORDER BY total_points DESC
LIMIT 0, 15
";
Ok the query works but it is adding them all up for all the available races from the race_stats.race_id column as the total points. I have racked my brain beyond recognition to fix this but I just can't quite seem to find the solution I need. I'm sure it has to be an easy fix but I just can't get it. Any help is greatly appreciated.
///////////////////EDITED WITH RAW VALUES//////////////////////
INSERT INTO `race_stats` (`id_race`, `race_id`, `user_id`, `f`, `s`, `race_interval`, `race_laps`, `led`, `points`, `total_points`, `race_status`, `tournament_id`, `driver`, `tournament_name`) VALUES
(1, 1, 4, 1, 4, '135.878', 60, '2', 180, 0, 'Running', 1, 'new_driver_5', ''),
(2, 1, 2, 2, 2, '-0.08', 60, '22', 175, 0, 'Running', 1, 'new_driver_38', ''),
(3, 1, 5, 3, 5, '-11.82', 60, '2', 170, 0, 'Running', 1, 'new_driver_94', ''),
(4, 2, 2, 1, 15, '138.691', 29, '6', 180, 0, 'Running', 2, 'new_driver_38', ''),
(5, 2, 15, 2, 9, '-16.12', 29, '8*', 180, 0, 'Running', 2, 'new_driver_44', ''),
(6, 2, 8, 3, 11, '-2:03.48', 29, '0', 165, 0, 'Running', 2, 'new_driver_83', ''),
Let me know if this is what you meant by raw values if not I can get some more data for you.
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为了完整性,仅在此处发布解决方案:
Just posting the solution here for completeness:
这是您想要的查询(为了便于阅读而格式化):
使用外连接(即 LEFT JOIN )的优点是没有统计数据的驱动程序仍然可以获得一行,但带有 null 。代码> 作为total_points。
ps 我不知道您的查询中
"."
的用法是什么,所以我删除了它。Here's the query you want (formatted for readability):
The advantage of using an outer join (ie
LEFT JOIN
) is that drivers who have no stats still get a row, but withnull
as total_points.p.s. I don't know what the usage of
"."
in your query is all about, so I removed it.