Ik有一个以随机顺序显示路由信息的表,如下所示:
from to street
----------------------------------
92 91 Lange Poten
100 104 Bagijnestraat
85 79 Korte Poten
91 85 Plein
79 100 Bezuidenhoutseweg
我正在尝试找到一种使用路由信息对其进行排序的方法,其中当前行的 to 列与下一行的from列相匹配。在这个例子中,我想要的顺序是:
from to street
----------------------------------
92 91 Lange Poten
91 85 Plein
85 79 Korte Poten
79 100 Bezuidenhoutseweg
100 104 Bagijnestraat
在从或到列上执行简单的ORDER BY不起作用,因为数字顺序不正确。我正在尝试寻找一种使用SQL或Excel的方法。
SQL小提琴在这里:http://sqlfiddle.com/#!2/9ebbb
发布于 2012-11-21 18:13:03
这在oracle中是有效的
select a.*
from route a
start with a.rowid = (select min(rowid) from route )
connect by prior a.t = a.f;
发布于 2012-11-21 18:27:00
SQL Server (2005+)将是
Declare @Routes Table([from] int, [to] int, [street] varchar(17))
INSERT INTO @Routes VALUES
(92, 91, 'Lange Poten'),
(100, 104, 'Bagijnestraat'),
(85, 79, 'Korte Poten'),
(91, 85, 'Plein'),
(79, 100, 'Bezuidenhoutseweg')
;With Cte AS
(
SELECT [from]
,[to]
,[street]
FROM @Routes
WHERE [from] = 92
UNION ALL
SELECT r.[from]
,r.[to]
,r. [street]
FROM @Routes AS r
JOIN Cte c
ON c.[to] = r.[from]
)
Select * From Cte
https://stackoverflow.com/questions/13490256
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