我使用的是SQL Server 2008 R2,而且我遇到了一个复杂的排序问题或问题,我无法找到解决方案。
为了更好地解释,我在下面发布了一个样本结果查询。在这种情况下,我们尝试显示位置的层次结构,但在正确排序父/子关系时,它们在其关系中不是按字母顺序排列的。正如你所看到的,"东海岸"和#34;西海岸"是顶级位置,因为它们的父位置(f_locationparent)等于(0)。但是,我喜欢"东海岸"在"西海岸"之前展示。显然,我不能简单地按f_locationname
排序,然后按f_lineage
排序,因为关系不会以正确的顺序显示。重要提示:顶级位置的父位置始终为(0),因为它们没有父级。
f_locationid f_locationparent f_locationname f_level f_lineage
-------------------------------------------------------------------------
4 0 West Coast 0 0_4
5 4 Los Angeles 1 0_4_5
6 5 Del Rey 2 0_4_5_6
7 5 Reseda 2 0_4_5_7
8 5 Crenshaw 2 0_4_5_8
9 0 East Coast 0 0_9
10 9 New York City 1 0_9_10
1 10 Queens 2 0_9_10_1
2 10 Bronx 2 0_9_10_2
3 10 Manhattan 2 0_9_10_3
以下是当前查询:
;WITH cte_locationlineage AS
(
SELECT a.f_locationid, a.f_locationparent, a.f_locationname, 0 AS f_level,
CONVERT(varchar(30), '0_' + convert(varchar(10), f_locationid)) f_lineage
FROM tb__templocations a
WHERE f_locationparent = '0'
UNION ALL
SELECT a.f_locationid,
a.f_locationparent,
a.f_locationname,
c.f_level + 1,
CONVERT(varchar(30), f_lineage + '_'
+ convert(varchar(10), a.f_locationid))
FROM cte_locationlineage c
JOIN tb__templocations a
ON a.f_locationparent = c.f_locationID
)
SELECT *
FROM cte_locationlineage c
ORDER BY f_lineage
如您所见,它是基于沿袭的顺序排序的,后者是位置ID(f_locationID)的组合。不幸的是,正如您所看到的,位置ID并不总是按字母顺序排列。
Here是一个SQL小提琴,所以你可以看到它是如何工作的。
最后,使用相同的数据,这是我想要看到的结果查询,在父母之下的关系中,项目按字母顺序排序。因此对于东海岸"祖父母和"纽约市"父母,其下列出的孩子是按字母顺序排列的。
f_locationid f_locationparent f_locationname f_level f_lineage
-------------------------------------------------------------------------
9 0 East Coast 0 0_9
10 9 New York City 1 0_9_10
2 10 Bronx 2 0_9_10_2
3 10 Manhattan 2 0_9_10_3
1 10 Queens 2 0_9_10_1
4 0 West Coast 0 0_4
5 4 Los Angeles 1 0_4_5
8 5 Crenshaw 2 0_4_5_8
6 5 Del Rey 2 0_4_5_6
7 5 Reseda 2 0_4_5_7
答案 0 :(得分:10)
您可以使用ROW_NUMBER()
来提供帮助:
;WITH cte_locationlineage AS
(
SELECT a.f_locationid, a.f_locationparent, a.f_locationname, 0 AS f_level,
CONVERT(varchar(30), '0_' + convert(varchar(10), f_locationid)) f_lineage,
CAST(ROW_NUMBER() OVER(ORDER BY f_locationname) as decimal(8,4)) as ordering
FROM tb__templocations a
WHERE f_locationparent = '0'
UNION ALL
SELECT a.f_locationid,
a.f_locationparent,
a.f_locationname,
c.f_level + 1,
CONVERT(varchar(30), f_lineage + '_' + convert(varchar(10), a.f_locationid)),
cast(c.ordering + (CAST(ROW_NUMBER() OVER(ORDER BY a.f_locationname)
as decimal(8,4))/POWER(10,c.f_level + 1)) as decimal(8,4))
FROM cte_locationlineage c
JOIN tb__templocations a
ON a.f_locationparent = c.f_locationID
)
SELECT *
FROM cte_locationlineage c
ORDER BY c.ordering
通过这种方式,您可以对级别和位置名称进行组合,以便在列表中对内容进行排序。
但是,值得注意的是,如果你的餐桌很大,这可能不太实际。当您遇到越来越大的数据集时,ROW_NUMBER()
会变得相当慢。
编辑:如果您在一个关卡中有超过九行,那么问题就出现了,上面的示例就是这样。你必须增加幅度以反映足够的"空间"保存信息。例如,每个级别最多可以运行99行:
;WITH cte_locationlineage AS
(
SELECT a.f_locationid, a.f_locationparent, a.f_locationname, 0 AS f_level,
CONVERT(varchar(30), '0_' + convert(varchar(10), f_locationid)) f_lineage,
CAST(ROW_NUMBER() OVER(ORDER BY f_locationname) as decimal(12,8)) as ordering
FROM tb__templocations a
WHERE f_locationparent = '0'
UNION ALL
SELECT a.f_locationid,
a.f_locationparent,
a.f_locationname,
c.f_level + 1,
CONVERT(varchar(30), f_lineage + '_' + convert(varchar(10), a.f_locationid)),
cast(c.ordering + (CAST(ROW_NUMBER() OVER(ORDER BY a.f_locationname) as decimal(12,8))
/POWER(10,(c.f_level + 1)*2)) as decimal(12,8))
FROM cte_locationlineage c
JOIN tb__templocations a
ON a.f_locationparent = c.f_locationID
)
SELECT *
FROM cte_locationlineage c
ORDER BY c.ordering
显然,如果你的每个级别的行数远远高于999行,这将会变得很麻烦,但我怀疑,鉴于你的意见,这不应该是一个问题。
我很好奇是否有人有更聪明的方法来使用二进制来完成同样的事情;我今晚要看看能不算算数学。
答案 1 :(得分:2)
您可以按完整路径名对行进行排序,使用未使用的字符来连接名称。
WITH cte_locationlineage AS (
SELECT a.F_LocationId, a.f_locationparent, a.f_locationname,
0 AS f_level,
CONVERT(varchar(30), '0_' + convert(varchar(10), F_LocationId)) as f_lineage,
CONVERT(varchar(max), a.f_locationname) as Fullname -- Add this line
FROM tb__templocations a
WHERE f_locationparent = '0'
UNION ALL
SELECT a.F_LocationId,
a.f_locationparent,
a.f_locationname,
c.f_level + 1,
CONVERT(varchar(30), f_lineage + '_'
+ convert(varchar(10), a.F_LocationId)),
CONVERT(varchar(max), c.fullname + '_' + a.f_locationname) -- Add this line
FROM cte_locationlineage c
JOIN tb__templocations a ON a.f_locationparent = c.F_LocationId)
SELECT *
FROM cte_locationlineage c
ORDER BY fullname -- Change this line
答案 2 :(得分:-7)
首先排序顶级父母名称,然后排序血统
ORDER BY (select f_locationname from cte_locationlineage d
where d.F_Lineage = substring(c.F_lineage,1,3)), f_lineage
<强>更新强>
处理多位数ID:
ORDER BY (select f_locationname from cte_locationlineage d
where d.f_level = 0 and c.F_LiNEAGE + '_' like d.f_lineage + '[_]%'), f_lineage