1上个月表左连接当前月

Question

我有一个sql查询，用于比较当前月份和上个月的值。以下是我的查询

DECLARE @CurrentDate VARCHAR(100) 
DECLARE @Year VARCHAR(100)
DECLARE @Month VARCHAR(100)

SET @CurrentDate = (SELECT  MAX(Date_Key) AS CurrentMonth FROM LoanFact)

SET @Year = (SELECT CASE WHEN SUBSTRING(@CurrentDate,5,2) = 1 THEN (SUBSTRING(@CurrentDate,1,4) - 1) ELSE SUBSTRING(@CurrentDate,1,4) END )
SET @Month = (SELECT CASE WHEN SUBSTRING(@CurrentDate,5,2) = 1 THEN '12' ELSE (SUBSTRING(@CurrentDate,5,2) - 1) END )


;WITH cte AS (

SELECT DISTINCT  
CurrentMonth.ID, 
CurrentMonth.Date_Key, 
--CurrentMonth.Status AS CurrentMonth_Status, 
--previousMonth.Status AS PreviousMonth_Status,
--CurrentMonth.System_Key AS CurrentMonth_System_Key,
--previousMonth.System_Key AS previousMonth_System_Key,
CASE WHEN CurrentMonth.Status = PreviousMonth.Status THEN 0
WHEN CurrentMonth.Status <> PreviousMonth.Status AND CurrentMonth.Status = 'A' AND PreviousMonth.Status = 'N' then 115
WHEN CurrentMonth.Status <> PreviousMonth.Status AND CurrentMonth.Status = 'N' AND PreviousMonth.Status = 'A' then 150
WHEN CurrentMonth.System_Key = previousMonth.System_Key THEN 0
WHEN CurrentMonth.System_Key <> previousMonth.System_Key AND CurrentMonth.System_Key <=10 AND previousMonth.System_Key >=10 THEN 304
WHEN CurrentMonth.System_Key <> previousMonth.System_Key AND CurrentMonth.System_Key >=10 AND previousMonth.System_Key <=10 THEN 303
WHEN ((ISNULL(SeedAndChemYesNo, 'No') = 'Yes')) THEN '559'
END [Service_Action_type]


FROM 

(
SELECT  
ld.ID,
ld.Status ,
SUBSTRING(lf.System_Key, 3, 2) AS System_Key,
lf.Date_Key
FROM    
Fact lf
INNER JOIN Dimension ld ON lf.LKey = ld.LKey
LEFT JOIN CustomerFact ltcf ON lf.LKey = ltcf.LKey AND lf.Date_Key = ltcf.Date_Key
LEFT JOIN OrganizationDimension od ON od.Organization_Key = ltcf.Organization_Key

WHERE   
SUBSTRING(CAST(lf.Date_Key AS VARCHAR(100)),1,6) = SUBSTRING(@CurrentDate,1,6)
) CurrentMonth


INNER JOIN 

(

SELECT  
ld.ID,
ld.Status ,
SUBSTRING(lf.System_Key, 3, 2) AS System_Key,
lf.Date_Key
FROM    
Fact lf
INNER JOIN Dimension ld ON lf.L_Key = ld.L_Key
LEFT JOIN CustomerFact ltcf ON lf.L_Key = ltcf.L_Key AND lf.Date_Key = ltcf.Date_Key
LEFT JOIN OrganizationDimension od ON od.Organization_Key = ltcf.Organization_Key

WHERE   
SUBSTRING(CAST(lf.Date_Key AS VARCHAR(100)),1,4) = @Year
AND CASE WHEN  SUBSTRING(CAST(lf.Date_Key AS VARCHAR(100)),5,1) = 0 
        THEN REPLACE(SUBSTRING(CAST(lf.Date_Key AS VARCHAR(100)),5,2), '0','')
         ELSE SUBSTRING(CAST(lf.Date_Key AS VARCHAR(100)),5,2) END = @Month) PreviousMonth

ON CurrentMonth.LoanNumber = PreviousMonth.LoanNumber
LEFT JOIN [SeedAndChem] Issac ON PreviousMonth.ID = Issac.ID

现在因为case statement service action type如果满足一个条件并且正在检查其他条件，则会更新service action type。

我希望能够根据所有条件更新ID Service_Action_type 2653467 150 2523379 150，如果满足多个条件，我希望代码列通过在必要时创建重复ID来更新为这些值。

以下是我现在收到的示例数据。

示例数据：

ID          Service_Action_type
2653467     150
2653467     303
2653467     559
2523379     150
2523379     304
2523379     559

但如果有多个条件满足，我希望数据如下所示。

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Answer 1

需要进行更改：

1上个月表左连接当前月

2在select语句中，您必须检索previousmonth.id，previousmonth.date_key

    select 
    PreviousMonth.ID, 
    PreviousMonth.DateKey,
    Current_month.ID, 
    Current_month.DateKey
    , 
    CASE WHEN Current_month.Status = PreviousMonth.Status THEN 0 
    WHEN Current_month.Status <> PreviousMonth.Status AND Current_month.Status = 'A' AND PreviousMonth.Status = 'N' then 115
    WHEN Current_month.Status <> PreviousMonth.Status AND Current_month.Status = 'N' AND PreviousMonth.Status = 'A' then 150
    END [Service_Action_type]

     from
    (
    select '2653467' ID, 'jan' Datekey ,''Service_Action_type,'A'Status 
    union 
    select '2523379' ID,'Feb' Datekey ,''Service_Action_type,'B'
    union 
    select '2523379' ID,'march' Datekey ,''Service_Action_type,'N'
    ) PreviousMonth 
    Left Join
    (
    select '2523379' ID,'Apr' Datekey ,''Service_Action_type,'N' Status
    union
    select '2653467' ID,'Apr' Datekey ,''Service_Action_type,'N' Status
    ) Current_month 

    on Current_month.ID = PreviousMonth.ID

希望这有效！

Answer 2

我找到了解决方案。我只需要将case statement分成三个不同的case statements，然后UNPIVOT来自三个不同case statements的三个列。

感谢大家的时间和帮助。

比较并插入一列

2 个答案:

1上个月表左连接当前月

2在select语句中，您必须检索previousmonth.id，previousmonth.date_key