Question

我目前正在尝试完成将scd类型2数据加载到维度的查询的最后部分。根据下面提供的数据，我想生成一个可以插入到维度中的输出使旧记录到期并跟踪历史记录等。数据是我拥有属性已更改的最新记录。更改的值可以在Lookup列中找到，也可以在dateOfchange中找到，即更改发生的日期。这个dateOfchange显然应该成为最新记录的有效日期。

样本数据如下：

CREATE TABLE #tstDimPortfolio
(
[ID][INT] IDENTITY (1,1) NOT NULL,
[UPI] [varchar](20) NOT NULL,
[MF_CODE] [varchar](10) NULL,
[BH_Code] [varchar](10) NULL,
[CR_Code] [varchar](10) NULL,
[ValidFrom][varchar](10) NOT NULL,
[ValidTo][varchar](10) NULL,
[IsCurrent] [CHAR] (1) NULL,
[DateofChange] [varchar](10) NULL,
[LookupMF_CODE] [varchar](10) NULL,
[LookupBH_Code] [varchar](10) NULL,
[LookupCR_Code] [varchar](10) NULL,
) 

INSERT INTO #tstDimPortfolio
SELECT 'B06531','B06531','','B06531','20111230',NULL,'Y','20120101','','B06531', ''
UNION ALL
SELECT 'BLI003','','BLI003','BBL_WORLD','20111230',NULL,'Y','20120102','BLI004','',    ''UNION ALL 
SELECT 'BLI003','','BLI003','BBL_WORLD','20111230',NULL,'Y','20120103','BLI005','',    ''UNION ALL 
SELECT 'BLI027','BLI027','L147','BBL_GBN','20111230',NULL,'Y','20120104','','L146', ''

使用此数据，新输出应为

UPI MF_CODE   BH_Code  CR_Code   ValidFrom  ValidTo      IsCurrent
_______________________________________________________________________
B06531  B06531  B06531               20111230   20120101        N
B06531  B06531  B06531  B06531       20120101   NULL            Y
BLI003  BLI003  BBL_WORLD            20111230   20120102        N
BLI003  BLI004  BLI003  BBL_WORLD    20120102   20120103        N
BLI003  BLI005  BLI003  BBL_WORLD    20120103   NULL            Y
BLI027  BLI027  L147    BBL_GBN      20111230   20120104        N
BLI027  BLI027  L146    BBL_GBN      20120104   NULL            Y

任何想法

Answer 1

我很担心这张桌子上的自然键是什么。是“UPI？”如果是这样，你有两个具有相同UPI的记录（BLI003），但它们都是活动的，绝不应该是这种情况。

无论如何，假设它是UPI。如果我们想要更新B06531，请将您的更新放入表格中：

CREATE TABLE #tstDimPortfolioUpdates
(
[ID][INT] IDENTITY (1,1) NOT NULL,
[UPI] [varchar](20) NOT NULL,
[MF_CODE] [varchar](10) NULL,
[BH_Code] [varchar](10) NULL,
[CR_Code] [varchar](10) NULL,
[ValidFrom][varchar](20) NOT NULL,
[ValidTo][varchar](15) NULL,
[IsCurrent] [CHAR] (1) NULL,
[DateofChange] [varchar](10) NULL,
[LookupMF_CODE] [varchar](10) NULL,
[LookupBH_Code] [varchar](10) NULL,
[LookupCR_Code] [varchar](10) NULL,
) 


INSERT INTO #tstDimPortfolioUpdates
SELECT 'B06531','B06531','B06531','B06531','20120102',NULL,'Y','20120102','','B06531', ''

通过更改ValidTo，IsCurrent和DateOfChange值来设置任何不再有效的记录

UPDATE dp
SET ValidTo = '20120101', IsCurrent = 'N', DateOfChange = '20120101'
FROM #tstDimPortfolio dp
INNER JOIN #tstDimPortfolioUpdates up ON dp.UPI = up.UPI
AND dp.IsCurrent = 'Y'

插入新记录

INSERT INTO #tstDimPortfolio (UPI, MF_Code, BH_Code, CR_Code, ValidFrom, ValidTo
    ,IsCurrent, DateOfChange, LookupMF_Code, LookupBH_Code, LookupCR_Code)
SELECT UPI, MF_Code, BH_Code, CR_Code, ValidFrom, ValidTo
    ,IsCurrent, DateOfChange, LookupMF_Code, LookupBH_Code, LookupCR_Code
FROM #tstDimPortfolioUpdates

仔细检查更新是否正确

SELECT * FROM #tstDimPortfolio
ORDER BY UPI

Answer 2

我设法使用递归cte获得所需的结果。 UPI是自然的关键。但是，事件实际上来自一个单独的文件，该文件被旋转并连接到维度。（BLI003）有两行，因为它有两个事件。 sql如下：

 CREATE TABLE #tstDimPortfolio
 (
[ID][INT] IDENTITY (1,1) NOT NULL,
[UPI] [varchar](20) NOT NULL,
[MF_CODE] [varchar](10) NULL,
[BH_Code] [varchar](10) NULL,
[CR_Code] [varchar](10) NULL,
[ValidFrom][varchar](10) NOT NULL,
[ValidTo][varchar](10) NULL,
[IsCurrent] [CHAR] (1) NULL,
[DateofChange] [varchar](10) NULL,
[LookupMF_CODE] [varchar](10) NULL,
[LookupBH_Code] [varchar](10) NULL,
[LookupCR_Code] [varchar](10) NULL,


) 

INSERT INTO #tstDimPortfolio
SELECT 'B06531','B06531','','B06531','20111230',NULL,'Y','20120101','','B06531', ''UNION ALL
SELECT 'BLI003','','BLI003','BBL_WORLD','20111230',NULL,'Y','20120102','BLI004','', ''UNION ALL 
SELECT 'BLI003','','BLI003','BBL_WORLD','20111230',NULL,'Y','20120103','','BLI005', ''UNION ALL 
SELECT 'BLI027','BLI027','L147','BBL_GBN','20111230',NULL,'Y','20120104','','L146', ''





SELECT  ROW_NUMBER() OVER (PARTITION BY UPI ORDER BY UPI, DateofChange) Sequence,
    UPI, 
    CASE WHEN LookupMF_CODE <> '' THEN LookupMF_CODE ELSE MF_CODE END MF_CODE, 
    CASE WHEN LookupMF_CODE <> '' THEN LookupBH_Code ELSE BH_Code END BH_Code, 
    CASE WHEN LookupCR_Code <> '' THEN LookupCR_Code ELSE CR_Code  END CR_Code, 
    ValidFrom, ValidTo, IsCurrent, DateofChange,
    LookupMF_CODE,
    LookupBH_CODE,
    LookupCR_CODE
INTO #Dimension_Table
FROM #tstDimPortfolio


;WITH AddedDim AS
(SELECT * FROM 

(
SELECT 
ROW_NUMBER() OVER (PARTITION BY UPI ORDER BY UPI, DateofChange) Sequence,
UPI,
CASE WHEN LookupMF_CODE <> '' THEN LookupMF_CODE ELSE MF_CODE END MF_CODE, 
CASE WHEN LookupBH_CODE <> '' THEN LookupBH_Code ELSE BH_Code END BH_Code, 
CASE WHEN LookupCR_Code <> '' THEN LookupCR_Code ELSE CR_Code  END CR_Code, 
DateofChange AS ValidFrom, 
ValidTo, 
IsCurrent 
FROM #tstDimPortfolio
)A
WHERE SEQUENCE = 1

UNION ALL
SELECT  
DT.Sequence
, DT.UPI
,CASE WHEN DT.LookupMF_CODE <> '' THEN DT.LookupMF_CODE ELSE DM.MF_CODE END MF_CODE
,CASE WHEN DT.LookupBH_CODE <> '' THEN DT.LookupBH_Code ELSE DM.BH_Code END BH_Code 
,CASE WHEN DT.LookupCR_Code <> '' THEN DT.LookupCR_Code ELSE DM.CR_Code  END CR_Code
,DT.DateofChange AS ValidFrom 
,DT.ValidTo 
,DT.IsCurrent 
FROM #Dimension_Table dt inner join
AddedDim dm
on DT.UPI = DM.UPI
AND dt.Sequence = DM.Sequence + 1 
)

SELECT * INTO #temp FROM AddedDim

SCD类型2的T-SQL语法

2 个答案: