在SQL中避免过多的case语句？

时间：2018-05-02 19:51:36

标签： sql sql-server

我需要根据apptypecode和state驱动13或14个Datamatrix条形码。 我能做到这一点，但我的案例陈述太多了。

我想要完成的是当应用程序页面= 13时，我得到13个DataMatrix，当应用程序页面= 14时，我得到14个DataMatrix填充如下： - Barcode DataMatrix 第9页后 Datamatrix MS3000000002421831E9我开始使用字母A = 10，B = 11，C = 12 D = 13 AND E = 14 所以条形码看起来像这样：

DataMatrix

我的问题：如果不编写所有这些案例陈述，他们是另一种方法吗？

这是我的代码：

SELECT     C.CustomerID
      ,AT.ServiceTypeID
      ,[loadfilename]
      ,f.loadrowstatus
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'EI') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'EI') ELSE
      CASE WHEN F.primaryState IN('ND','AK') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D1')
      ELSE '' end END END AS BarCodeID
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E2') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E2') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D2')
      ELSE '' end END END AS DataMatrixCode2
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E3') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E3') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D3')
      ELSE '' end END END AS DataMatrixCode3
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E4') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E4') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D4')
      ELSE '' end END END AS DataMatrixCode4
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E5') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E5') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D5')
      ELSE '' end END END AS DataMatrixCode5
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E6') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E6') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D6')
      ELSE '' end END END AS DataMatrixCode6
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E7') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E7') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D7')
      ELSE '' end END END AS DataMatrixCode7
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E8') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E8') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D8')
      ELSE '' end END END AS DataMatrixCode8
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'E9') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'E9') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'D9')
      ELSE '' end END END AS DataMatrixCode9
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'EA') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'EA') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'DA')
      ELSE '' end END END AS DataMatrixCode10
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'EB') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'EB') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'DB')
      ELSE '' end END END AS DataMatrixCode11
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'EC') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'EC') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'DC')
      ELSE '' end END END AS DataMatrixCode12
     ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'ED') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'ED') ELSE
      CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'DD')
      ELSE '' end END END AS DataMatrixCode13
      ,CASE WHEN F.primaryState IN ('AL', 'AK','AR','ID','KY','LA','MI','MS','ND','SD','WA','WV') AND F.AppTypeCode IN (300,301,302,303,320,321,350)
      Then STUFF([BarCodeID],19,20,'EE') ELSE 
      CASE WHEN F.primaryState IN('OR') AND f.AppTypeCode IN (310,311,312,313,330,331) Then STUFF([BarCodeID],19,20,'EE') 
      --CASE WHEN F.primaryState IN('ND') AND f.AppTypeCode IN (310,311,312,313,330,331) THEN STUFF([BarCodeID],19,20,'DD')
      ELSE '' end END AS DataMatrixCode14
     ,ISNULL(f.[AppTypeCode],'') AS [AppTypeCode]
      ,ISNULL([LanguageCode],'') AS [LanguageCode]
      ,ISNULL(f.[FirstName],'') AS [FirstName]
      ,ISNULL(f.[LastName],'') AS [LastName]
      ,ISNULL([primaryAddress1],'') AS [ServiceAddress1]
      ,ISNULL([primaryAddress2],'') AS [ServiceAddress2]
      ,ISNULL([primaryApartmentNumber],'') AS [ServiceApartmentNumber]
      ,ISNULL([primaryCity],'') AS [ServiceCity]
      ,ISNULL([primaryState],'') AS [ServiceState]
      ,ISNULL([primaryZipCode5],'') AS [ServiceZipCode5]
      ,ISNULL([primaryZipCode4],'') AS [ServiceZipCode4]
      ,ISNULL(f.[mailingAddress1],'') AS [BillingAddress1]
      ,ISNULL(f.[mailingAddress2],'') AS [BillingAddress2]
      ,ISNULL([mailingApartmentNumber],'') AS [BillingApartmentNumber]
      ,ISNULL([mailingCity],'') AS [BillingCity]
      ,ISNULL([mailingState],'') AS [BillingState]
      ,ISNULL([mailingZipCode5],'') AS [BillingZip5]
      ,ISNULL([mailingZipCode4],'') AS [BillingZip4]
      ,ISNULL([ReasonCodes],'') AS [ReasonCodes]
      ,ISNULL(f.[ContactPhoneNumber],'') AS [PhoneNumber]
      ,ISNULL([ContactEmailAddress],'') AS [EmailAddress]
      ,CASE WHEN at.servicetypeid='M' THEN ISNULL([CustomerAccountNumber],'') ELSE
      ISNULL(InternetAcctNum,'') END AS [CustomerAccountNumber]
     ,ISNULL([CustomerServiceNumber],'') AS [CustomerServiceNumber]
  FROM [outboundprocess].[DailyFulfillmentFile] F
  JOIN dbo.AppTypes AT ON AT.AppTypeID=f.AppTypeCode
  JOIN dbo.Customers c ON c.CustomerID=f.CustomerID
WHERE f.loadrowstatus = 'Loaded' AND AT.servicetypeid='M' AND c.ServiceAddressState<>'NV';

1 个答案:

答案 0 :(得分：3)

您应该创建一个映射表，其中包含PrimaryState和AppType组合以及它们映射到的BarcodeID值。然后你可以通过映射表加入你的表。

这样做还可以提高查询性能，因为SQL Server可以执行set操作而不是CASE语句所需的循环。

CREATE TABLE map
(
    PrimaryState VARCHAR(255),
    AppTypeCode INT,
    BarCodeID VARCHAR(255)
);

（根据需要调整数据类型）

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