我有一个表格,以常规的分层方式存储公司信息及其母公司,包括companyid,parentid和name。
我只是在Sql Server中学习CTE查询并编写此查询
WITH tableR (ParentCompanyID, CompanyID, Levels)
AS
(
-- Anchor member definition
SELECT e.ParentCompanyID, e.CompanyID, 0 As Levels
FROM tblCompany AS e
WHERE ParentCompanyID in (9)
UNION ALL
-- Recursive member definition
SELECT e.ParentCompanyID, e.CompanyID, Levels + 1
FROM tblCompany AS e
INNER JOIN tableR AS d
ON e.ParentCompanyID = d.CompanyID
)
-- Statement that executes the CTE
SELECT tabler.Levels, tableR.CompanyID, (left('--------------', (tabler.Levels* 2)) + c.CompanyName) as CName,c.ParentCompanyID
FROM tableR Left join tblcompany c on tableR.CompanyId=c.CompanyID
这样可以正常工作,除了它首先列出ID = 9的Child,然后列出第一级子级然后级别2 ......依此类推,但我需要的是将Child数据放在其父级之下,所以
L0
L1
L2
L1-1
L2-1
....
有可能吗?因为如果没有,那么我必须在我正在使用的C#代码中递归地执行它。
我也试试这个
WITH tableR (ParentCompanyID, CompanyID, Levels, RowNumber)
AS
(
-- Anchor member definition
SELECT e.ParentCompanyID, e.CompanyID, 1 As Levels, CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx)) as RowNumber
FROM tblCompany AS e
WHERE ParentCompanyID in (9)
UNION ALL
-- Recursive member definition
SELECT e.ParentCompanyID, e.CompanyID, Levels + 1, CAST(Concat(d.RowNumber, CAST((Row_Number() Over (Order by e.CompanyName) ) as VARCHAR(MAX)) ) as VARCHAR(MAX)) as RowNumber
FROM tblCompany AS e
INNER JOIN tableR AS d
ON e.ParentCompanyID = d.CompanyID
)
-- Statement that executes the CTE
SELECT tabler.Levels, RowNumber, tableR.CompanyID, (left('--------------', ((tabler.Levels - 1)* 2 )) + c.CompanyName) as CName,c.ParentCompanyID
FROM tableR Left join tblcompany c on tableR.CompanyId=c.CompanyID order by RowNumber
但如果任何Level有超过9条记录,则失败。
答案 0 :(得分:2)
试试这个解决方案:
DECLARE @Company TABLE
(
CompanyID INT PRIMARY KEY,
Name NVARCHAR(50) NOT NULL,
ParentCompanyID INT NULL
);
INSERT @Company (CompanyID,Name,ParentCompanyID)
VALUES
(8,N'Tomaten',NULL),
(9,N'NON ĂNŞI chars',NULL),
(10,N'Bananen',NULL),
(11,N'Child #1',9),
(12,N'Child #2',9),
(13,N'Child #1.1',11),
(14,N'Child #1.2',11);
DECLARE @ParentCompanyID INT = 9;
WITH RecComp
AS
(
SELECT crt.CompanyID,
crt.Name,
crt.ParentCompanyID,
1 AS Lvl,
N'/' + CONVERT(NVARCHAR(4000),crt.CompanyID) + N'/' AS CompanyNode_AsChar
FROM @Company crt
WHERE crt.ParentCompanyID = @ParentCompanyID
UNION ALL
SELECT cld.CompanyID,
cld.Name,
cld.ParentCompanyID,
prt.Lvl + 1,
prt.CompanyNode_AsChar + CONVERT(NVARCHAR(4000), cld.CompanyID) + N'/'
FROM RecComp prt -- parent
INNER JOIN @Company cld ON prt.CompanyID = cld.ParentCompanyID
)
SELECT *,
CONVERT(HIERARCHYID, CompanyNode_AsChar) AS CompanyNode
FROM RecComp
ORDER BY CompanyNode;
结果:
CompanyID Name ParentCompanyID Lvl CompanyNode_AsChar CompanyNode
--------- ---------- --------------- --- --------------------- -----------
11 Child #1 9 1 /11/ 0xAE
13 Child #1.1 11 2 /11/13/ 0xAF6C
14 Child #1.2 11 2 /11/14/ 0xAF74
12 Child #2 9 1 /12/ 0xB2
答案 1 :(得分:0)
嗯,事情是,你没有ORDER BY子句。
为什么不至少尝试
-- Statement that executes the CTE
SELECT tabler.Levels, tableR.CompanyID, (left('--------------', (tabler.Levels* 2)) + c.CompanyName) as CName,c.ParentCompanyID
FROM tableR Left join tblcompany c on tableR.CompanyId=c.CompanyID
ORDER BY tableR.Levels
也就是说,显示/ UI分区可能应该由UI输出,而不是您的查询。
这几乎看起来你希望在TreeView中使用它来显示它。
答案 2 :(得分:0)
好的,最后我找到了一个问题的解决方案。为了得到评论家,如果我在这里帮助其他人,那就是
WITH tableR (ParentCompanyID, CompanyID, Levels, RowNumber, RowNumber2)
AS
(
-- Anchor member definition
SELECT e.ParentCompanyID, e.CompanyID, 1 As Levels, CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx)) as RowNumber,
CAST(
(Left('000', 3-Len(CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx)))) + CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx)))
As VARCHAR(MAX)
) AS RowNumber2
FROM tblCompany AS e
WHERE ParentCompanyID in (370)
UNION ALL
-- Recursive member definition
SELECT e.ParentCompanyID, e.CompanyID, Levels + 1, CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx)) as RowNumber1,
CAST(
Concat(d.RowNumber2,
Left('000', 3-Len(CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx)))),
CAST((Row_Number() Over (Order by e.CompanyName) ) as Varchar(MAx))
) as VARCHAR(MAX)) as RowNumber2
FROM tblCompany AS e
INNER JOIN tableR AS d
ON e.ParentCompanyID = d.CompanyID
)
-- Statement that executes the CTE
SELECT tabler.Levels, RowNumber, RowNumber2, tableR.CompanyID, (left('--------------', ((tabler.Levels - 1)* 2 )) + c.CompanyName) as CName,c.ParentCompanyID
FROM tableR Left join tblcompany c on tableR.CompanyId=c.CompanyID order by RowNumber2, CName
现在,解释如下:
已知问题:当您点击Anchor查询输出>时,它会被击败。 10行,或者实际上任何超过10行的行,然后锚点查询将ID指定为11,子进程为111并混淆输出。
上述问题的解决方案:我修改我的查询以使用LEFT并附加000,所以如果我看到我最多可以有100个孩子,如果你看到4就把3个零然后使用0000并在查询中改变3到4。
但是:我强烈推荐上面的答案,因为这样做。
答案 3 :(得分:0)
我想分享一下
如果你想订购de data ...字母和子数据就在他们的父母之下..创建一个baseCTE,使用row_number而不是CompanyID,从Base CTE调用Anchor查询
BASE CTE
ROW_NUMBER() OVER ( PARTITION BY ParentCompanyID ORDER BY CompanyName) as [row_number]
锚定查询
N'/' + CONVERT(NVARCHAR(4000),[row_number]) + N'/' AS CompanyNode_AsChar
递归查询
prt.CompanyNode_AsChar + CONVERT(NVARCHAR(4000), [row_number]) + N'/'