问题描述
我们有一个表LedgerAccount，其父子关系类似于：
CREATE TABLE [dbo].[LedgerAccounts](
[ledger_key] [int] NOT NULL,[Ledger] [nvarchar](12) NULL,[LedgerLevel] [int] NULL,[ParentAccount] [nvarchar](12) NULL,[LedgerDescription] [nvarchar](30) NULL,CONSTRAINT [PK_LedgerAccount] PRIMARY KEY CLUSTERED
(
[ledger_key] ASC
)WITH (PAD_INDEX = OFF,STATISTICS_norECOmpuTE = OFF,IGnorE_DUP_KEY = OFF,ALLOW_ROW_LOCKS = ON,ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
INSERT INTO [dbo].[LedgerAccounts]
VALUES (40,'020000','020999','Participation'),(41,20,'021000','Participation in Group'),(42,'021999','Loans to..'),(43,'022000','Loans to group company'),(44,'022999','Participation in'),(45,'029999','Other Participation'),(46,30,'059999','Financial Fixed Assets'),(47,50,'TOT.BALANS','Fixed Assets'),(48,90,'TOT.GB','Total Balance sheet'),(49,99,'NULL','Total GL')
LedgerLevel定义层次结构中的级别。父级059999位于最高级别（在本示例中，即90），而0是最低级别的子节点。 我需要使用上表中的层次关系创建一个表/结构/tmp.table，如下所示：
在这里，我们可以参数化级别和级别ID的数量。 以下是我在不考虑参数化并且假设级别数= 4的情况下尝试的查询。 如何在不对级别数和级别ID进行硬编码的情况下实现相同目标？ 我是sql的新手，并且具有sql的基本知识。
create or alter view [dbo].[Ledgerview] as
WITH LedgerAccountstree AS
(
SELECT
ledger_key,Ledger as CurrLedgerCode,Ledger,Ledger as Lvl0Code,LedgerDescription as Lvl0Description,cast('-' as nvarchar(12)) as Lvl1Code,cast('-' as nvarchar(30)) as Lvl1Description,cast('-' as nvarchar(12)) as Lvl2Code,cast('-' as nvarchar(30)) as Lvl2Description,cast('-' as nvarchar(12)) as Lvl3Code,cast('-' as nvarchar(30)) as Lvl3Description,ParentAccount,LedgerLevel
FROM
[dbo].[LedgerAccounts]
WHERE
LedgerLevel = 50
UNION ALL
SELECT
[dbo].[LedgerAccounts].ledger_key,LedgerAccountstree.CurrLedgerCode,[dbo].[LedgerAccounts].Ledger,LedgerAccountstree.Lvl0Code,LedgerAccountstree.Lvl0Description,case when [dbo].[LedgerAccounts].LedgerLevel = 30 then [dbo].[LedgerAccounts].Ledger else LedgerAccountstree.Lvl1Code end as Lvl1Code,case when [dbo].[LedgerAccounts].LedgerLevel = 30 then [dbo].[LedgerAccounts].LedgerDescription else LedgerAccountstree.Lvl1Description end as Lvl1Description,case when [dbo].[LedgerAccounts].LedgerLevel = 20 then [dbo].[LedgerAccounts].Ledger else LedgerAccountstree.Lvl2Code end as Lvl2Code,case when [dbo].[LedgerAccounts].LedgerLevel = 20 then [dbo].[LedgerAccounts].LedgerDescription else LedgerAccountstree.Lvl2Description end as Lvl2Description,case when [dbo].[LedgerAccounts].LedgerLevel = 0 then [dbo].[LedgerAccounts].Ledger else LedgerAccountstree.Lvl3Code end as Lvl3Code,case when [dbo].[LedgerAccounts].LedgerLevel = 0 then [dbo].[LedgerAccounts].LedgerDescription else LedgerAccountstree.Lvl3Description end as Lvl3Description,[dbo].[LedgerAccounts].ParentAccount,[dbo].[LedgerAccounts].LedgerLevel
FROM
[dbo].[LedgerAccounts]
JOIN
LedgerAccountstree
ON LedgerAccountstree.Ledger = [dbo].[LedgerAccounts].[ParentAccount]
)
SELECT
ledger_key,Lvl0Code +'-'+ Lvl0Description as Level0,Lvl1Code +'-'+ Lvl1Description as Level1,Lvl2Code +'-'+ Lvl2Description as Level2,Lvl3Code +'-'+ Lvl3Description as Level3
FROM
LedgerAccountstree
GO
解决方法
这应该可以满足您的需求。 这里有很多事情要做，并且试图将其分解为详尽的细节将很快成为TLDR。因此，如果您对我为什么要做某事或某事如何工作有特定疑问，请在评论中提出，然后我将更新答案以包含这些具体细节。
USE tempdb;
GO
IF OBJECT_ID('tempdb.dbo.LedgerAccounts','U') IS NOT NULL
BEGIN DROP TABLE tempdb.dbo.LedgerAccounts; END;
GO
CREATE TABLE tempdb.dbo.LedgerAccounts (
ledger_key int NOT NULL,Ledger nvarchar (12) NULL,LedgerLevel int NULL,ParentAccount nvarchar (12) NULL,LedgerDescription nvarchar (30) NULL,CONSTRAINT PK_LedgerAccount
PRIMARY KEY CLUSTERED (ledger_key ASC)
WITH (PAD_INDEX = OFF,STATISTICS_NORECOMPUTE = OFF,IGNORE_DUP_KEY = OFF,ALLOW_ROW_LOCKS = ON,ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY];
GO
INSERT INTO tempdb.dbo.LedgerAccounts
VALUES (40,'020000','020999','Participation'),(41,20,'021000','Participation in Group'),(42,'021999','Loans to..'),(43,'022000','Loans to group company'),(44,'022999','Participation in'),(45,'029999','Other Participation'),(46,30,'059999','Financial Fixed Assets'),(47,50,'TOT.BALANS','Fixed Assets'),(48,90,'TOT.GB','Total Balance sheet'),(49,99,'NULL','Total GL');
GO
-- SELECT * FROM tempdb.dbo.LedgerAccounts la;
--=====================================================================================================================
--=====================================================================================================================
IF OBJECT_ID('tempdb..#build_path','U') IS NOT NULL
BEGIN DROP TABLE #build_path; END;
GO
CREATE TABLE #build_path (
ledger_key int NOT NULL,Ledger nvarchar(12) NOT NULL,ParentAccount nvarchar(30) NOT NULL,h_level int NOT NULL,h_path nvarchar(4000) NOT NULL
);
GO
WITH
cte_build_path AS (
SELECT
la.ledger_key,la.Ledger,la.ParentAccount,h_level = 0,h_path = CONVERT(nvarchar(4000),RIGHT(REPLICATE(N' ',50) + la.ledger + N'-' + la.LedgerDescription,50))
FROM
dbo.LedgerAccounts la
WHERE
la.Ledger LIKE '[0-9][0-9][0-9][0-9][0-9][0-9]'
AND la.ParentAccount NOT LIKE '[0-9][0-9][0-9][0-9][0-9][0-9]'
UNION ALL
SELECT
la.ledger_key,h_level = bp.h_level + 1,bp.h_path + RIGHT(REPLICATE(N' ',50))
FROM
dbo.LedgerAccounts la
JOIN cte_build_path bp
ON la.ParentAccount = bp.Ledger
)
INSERT #build_path (ledger_key,Ledger,ParentAccount,h_level,h_path)
SELECT
bp .ledger_key,bp.Ledger,bp.ParentAccount,bp.h_level,bp.h_path
FROM
cte_build_path bp;
GO
-- SELECT * FROM #build_path bp
--=====================================================================================================================
DECLARE
@d_col_count int = (SELECT MAX(bp.h_level) FROM #build_path bp) + 1,@d_sql nvarchar(MAX) = N'',@debug bit = 0;
SELECT TOP (@d_col_count)
@d_sql = CONCAT(@d_sql,N',[level',x.rn,N'] = CASE WHEN bp.h_level >= ',N' THEN LTRIM(SUBSTRING(bp.h_path,',x.rn * 50 + 1,50)) ELSE N''---'' END'
)
FROM
(
SELECT TOP (@d_col_count)
rn = ROW_NUMBER() OVER (ORDER BY ac.object_id) - 1
FROM
sys.all_columns ac
) x
ORDER BY
x.rn ASC;
SELECT @d_sql = CONCAT(N'
SELECT
bp.ledger_key,bp.Ledger',@d_sql,N'
FROM
#build_path bp;');
IF @debug = 1
BEGIN
PRINT(@d_sql);
END;
ELSE
BEGIN
EXEC sys.sp_executesql @d_sql
END;
GO
结果...
ledger_key Ledger level0 level1 level2 level3 level4 level5 level6 level7
----------- ------------ -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- --------------------------------------------------
47 059999 059999-Fixed Assets --- --- --- --- --- --- ---
46 029999 059999-Fixed Assets 029999-Financial Fixed Assets --- --- --- --- --- ---
45 022999 059999-Fixed Assets 029999-Financial Fixed Assets 022999-Other Participation --- --- --- --- ---
44 022000 059999-Fixed Assets 029999-Financial Fixed Assets 022999-Other Participation 022000-Participation in --- --- --- ---
43 021999 059999-Fixed Assets 029999-Financial Fixed Assets 022999-Other Participation 022000-Participation in 021999-Loans to group company --- --- ---
42 021000 059999-Fixed Assets 029999-Financial Fixed Assets 022999-Other Participation 022000-Participation in 021999-Loans to group company 021000-Loans to.. --- ---
41 020999 059999-Fixed Assets 029999-Financial Fixed Assets 022999-Other Participation 022000-Participation in 021999-Loans to group company 021000-Loans to.. 020999-Participation in Group ---
40 020000 059999-Fixed Assets 029999-Financial Fixed Assets 022999-Other Participation 022000-Participation in 021999-Loans to group company 021000-Loans to.. 020999-Participation in Group 020000-Participation