我有一张带假日巴士旅行时间的SQL表。此表结合了传出行程和返回行程(选项0正在进行,选项1正在返回),它还为用户提供多种选择(选项2计算选项:3次行程和2次返程)。每次旅行可能跨越多行,因为该表列出了所有停靠点:
状况:
返回
选项列显示旅行是否正在进行或返回。 Option2列将选项匹配在一起。 Option3列显示每个选项的正确顺序。
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
| ID | DepartureDateTime | ArrivalDateTime | Departure | Arrival | Option | Option2 | Option3 |
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
| 72 | 2013-10-01 13:45:00 | 2013-10-02 16:40:00 | London | Amsterdam | 0 | 0 | 0 |
| 73 | 2013-10-02 17:35:00 | 2013-10-03 19:05:00 | Amsterdam | Berlin | 0 | 0 | 1 |
| 74 | 2013-10-01 17:00:00 | 2013-10-02 19:50:00 | London | Zurich | 0 | 1 | 0 |
| 75 | 2013-10-02 21:10:00 | 2013-10-03 22:40:00 | Zurich | Berlin | 0 | 1 | 1 |
| 76 | 2013-10-01 06:00:00 | 2013-10-02 08:40:00 | London | Paris | 0 | 2 | 0 |
| 77 | 2013-10-02 12:30:00 | 2013-10-03 14:05:00 | Paris | Rome | 0 | 2 | 1 |
| 78 | 2013-10-03 12:30:00 | 2013-10-04 14:05:00 | Rome | Berlin | 0 | 2 | 2 |
| 79 | 2013-10-10 14:50:00 | 2013-10-11 16:30:00 | Berlin | Amsterdam | 1 | 0 | 0 |
| 80 | 2013-10-11 17:05:00 | 2013-10-12 17:50:00 | Amsterdam | London | 1 | 0 | 1 |
| 81 | 2013-10-10 06:45:00 | 2013-10-11 08:25:00 | Berlin | Zurich | 1 | 1 | 0 |
| 82 | 2013-10-11 15:20:00 | 2013-10-12 16:05:00 | Zurich | London | 1 | 1 | 1 |
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
我想要两个不同的查询:
1)根据两件事对表格进行排序: 一个。对于传出:旅行的初始描述(离开伦敦),而不会弄乱后续停止的顺序。 湾返回:最后回程的到来(进入伦敦),再次没有弄乱后续停靠的顺序。
2)仅返回符合特定日期/时间范围的旅行:初始出发(离开伦敦)和最终返回(进入伦敦)。例如,显示早晨出发和晚上到达的旅行。
如果您需要更多详细信息或错过了某些内容,请与我们联系。
提前感谢您的帮助。
编辑1
请阅读我的整个帖子。这里重要的是,行彼此相关。例如,下面的两行必须是“在一起”,我正在处理的应用程序取决于顺序是正确的:
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
| ID | DepartureDateTime | ArrivalDateTime | Departure | Arrival | Option | Option2 | Option3 |
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
| 72 | 2013-10-01 13:45:00 | 2013-10-02 16:40:00 | London | Amsterdam | 0 | 0 | 0 |
| 73 | 2013-10-02 17:35:00 | 2013-10-03 19:05:00 | Amsterdam | Berlin | 0 | 0 | 1 |
这意味着,不能按出发日期排序,因为行会混淆。
所以,如果我想根据出发点对上述行程进行排序,首先会出现伦敦到柏林的巴黎之旅,因为它早上6点出发:
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
| ID | DepartureDateTime | ArrivalDateTime | Departure | Arrival | Option | Option2 | Option3 |
+----+---------------------+---------------------+------------------+----------------+--------------+---------------+---------------+
| 76 | 2013-10-01 06:00:00 | 2013-10-02 08:40:00 | London | Paris | 0 | 2 | 0 |
| 77 | 2013-10-02 12:30:00 | 2013-10-03 14:05:00 | Paris | Rome | 0 | 2 | 1 |
| 78 | 2013-10-03 12:30:00 | 2013-10-04 14:05:00 | Rome | Berlin | 0 | 2 | 2 |
| 72 | 2013-10-01 13:45:00 | 2013-10-02 16:40:00 | London | Amsterdam | 0 | 0 | 0 |
| 73 | 2013-10-02 17:35:00 | 2013-10-03 19:05:00 | Amsterdam | Berlin | 0 | 0 | 1 |
上面的部分表显示了排序结果的样子。基本上,排序算法应该考虑具有初始离开的行并忽略排序中的其他行,但最终结果应该在初始行程“下方”的行程中具有相关的停靠点。
这听起来有点可怕吗?
任何帮助都将不胜感激。
编辑2
根据要求,我使用的是MySQL 5.1。
编辑3
成员@fancyPants已解决了第一个查询。我做了一些修改,以考虑从Option = 0到Option = 1的变化:
SELECT
`ID`, `DepartureDateTime`, `ArrivalDateTime`, `Departure`, `Arrival`, `Option`, `Option2`, `Option3`
FROM (
SELECT
t.*,
CASE WHEN Option != @prev OR Option2 != @prev2 THEN @min_date := DepartureDateTime ELSE @min_date END as min_date,
CASE WHEN Option2 = @prev2 THEN @counter := @counter + 1 ELSE @counter := 0 END as counter,
@prev := Option, @prev2 := Option2
FROM Table1 t
, (SELECT @min_date:=(SELECT DepartureDateTime FROM Table1 ORDER BY `Option`, Option2, Option3 LIMIT 1), @counter:=0, @prev:=NULL, @prev2:=NULL) vars
order by `Option`, Option2, Option3
) sq
ORDER BY min_date, counter
谢谢你的朋友们,令人惊讶的工作!
不幸的是,我对第二个查询还不够清楚。我需要的是建立在第一个查询之上(从而对结果进行排序),然后根据日期时间范围限制结果。
答案 0 :(得分:2)
这不是那么容易,这就是我提出的(假设MySQL):
根据两件事对表格进行排序:a。对于传出:旅行的初始描述(离开伦敦),而不会弄乱后续停留的顺序:
SELECT
`ID`, `DepartureDateTime`, `ArrivalDateTime`, `Departure`, `Arrival`, `Option`, `Option2`, `Option3`
FROM (
SELECT
t.*,
CASE WHEN Option2 != @prev THEN @min_date := DepartureDateTime ELSE @min_date END as min_date,
CASE WHEN Option2 = @prev THEN @counter := @counter + 1 ELSE @counter := 0 END as counter,
@prev := Option2
FROM Table1 t
, (SELECT @min_date:=(SELECT DepartureDateTime FROM Table1 ORDER BY `Option`, Option2, Option3 LIMIT 1), @counter:=0, @prev:=NULL) vars
order by `Option`, Option2, Option3
) sq
ORDER BY min_date, counter
返回:
SELECT
`ID`, `DepartureDateTime`, `ArrivalDateTime`, `Departure`, `Arrival`, `Option`, `Option2`, `Option3`
FROM (
SELECT
t.*,
CASE WHEN Option2 != @prev THEN @min_date := ArrivalDateTime ELSE @min_date END as min_date,
CASE WHEN Option2 = @prev THEN @counter := @counter + 1 ELSE @counter := 0 END as counter,
@prev := Option2
FROM Table1 t
, (SELECT @min_date:=(SELECT ArrivalDateTime FROM Table1 ORDER BY `Option`, Option2, Option3 LIMIT 1), @counter:=0, @prev:=NULL) vars
order by `Option`, Option2, Option3
) sq
ORDER BY min_date, counter
对于你的第二个问题,如果我理解正确你想要这样的事情:
SELECT
t1.DepartureDateTime AS t1dep,
t2.ArrivalDateTime AS t2arr
, t1.*, t2.*
FROM Table1 t1
INNER JOIN Table1 t2 ON t1.Option = t2.Option AND t1.Option2 = t2.Option2
WHERE t1.Option3 = (SELECT MIN(Option3) FROM Table1 t3 WHERE t1.Option = t3.Option AND t1.Option2 = t3.Option2)
AND t2.Option3 = (SELECT MAX(Option3) FROM Table1 t3 WHERE t1.Option = t3.Option AND t1.Option2 = t3.Option2)
AND t1.DepartureDateTime BETWEEN '2013-10-01 05:00:00' AND '2013-10-01 07:00:00'
AND t2.ArrivalDateTime BETWEEN '2013-10-04 14:00:00' AND '2013-10-04 15:00:00'
此查询返回最小出发日期,即行程第一站的出发日期和最后一站的到达日期。然后你可以简单地调整where子句。
SELECT
l.* FROM
(
SELECT
`ID`, `DepartureDateTime`, `ArrivalDateTime`, `Departure`, `Arrival`, `Option`, `Option2`, `Option3`
,min_date, counter
FROM (
SELECT
t.*,
CASE WHEN `Option` != @prev OR Option2 != @prev2 THEN @min_date := DepartureDateTime ELSE @min_date END as min_date,
CASE WHEN Option2 = @prev2 THEN @counter := @counter + 1 ELSE @counter := 0 END as counter,
@prev := `Option`, @prev2 := Option2
FROM Table1 t
, (SELECT @min_date:=(SELECT DepartureDateTime FROM Table1 ORDER BY `Option`, Option2, Option3 LIMIT 1), @counter:=0, @prev:=NULL, @prev2:=NULL) vars
order by `Option`, Option2, Option3
) sq
) l
INNER JOIN
(SELECT `Option`, Option2 FROM Table1 WHERE DepartureDateTime BETWEEN '2013-10-02 11:30:00' AND '2013-10-02 13:00:00'
OR ArrivalDateTime BETWEEN '2013-10-03 14:00:00' AND '2013-10-03 14:15:00'
) r
ON l.`Option` = r.`Option` AND l.Option2 = r.Option2
ORDER BY min_date, counter
答案 1 :(得分:0)
第一个问题 - 去查询
select * from time_table
where option = 0
order by DepartureDateTime, Option2, Option3;
第一个问题 - 返回查询
select * from time_table
where option = 1
order by ArrivalDateTime, Option2, Option3;
此结果基于了解您的要求。它不是很清楚。
请为第二个问题添加一些细节。无法理解这个问题。 举例说明数据。