嵌套的大小寫限制

Question

我試圖使用嵌套大小寫，但是SQL在給出10個限制時給我一個錯誤。以下是我的SQL。你有什麼建議嗎？

ALTER VIEW [dbo].[vwOpti_ChannelPreference] AS 
SELECT SUB.*, 
CASE WHEN PCYCResponse + JBIResponse > 1 THEN 'SF Multi' 
ELSE CASE WHEN MDLResponse + SermoResponse + BioPharmResponse + MedscapeResponse + PharmaConnectResponse + THResponse 
       + OtherResponse > 1 THEN 'MCM Multi' 

ELSE CASE WHEN MDLResponse + SermoResponse + BioPharmResponse + MedscapeResponse + PharmaConnectResponse + THResponse 
       + PCYCResponse + JBIResponse + OtherResponse > 1 THEN 'SF & MCM Multi' 

ELSE CASE WHEN MDLResponse + SermoResponse + BioPharmResponse + MedscapeResponse + PharmaConnectResponse + THResponse 
       + PCYCResponse + JBIResponse + OtherResponse = 0 THEN 'None' 

ELSE CASE WHEN MDLResponse = 1 THEN 'MDL' 
ELSE CASE WHEN SermoResponse = 1 THEN 'Sermo' 
ELSE CASE WHEN BioPharmResponse = 1 THEN 'BioPharmCommunications' 
ELSE CASE WHEN MedscapeResponse = 1 THEN 'Medscape' 
ELSE CASE WHEN PharmaConnectResponse = 1 THEN 'PharmaConnect' 
ELSE CASE WHEN THResponse = 1 THEN 'Targeted Healthcare' 
ELSE CASE WHEN PCYCResponse = 1 THEN 'PCYC' 
ELSE CASE WHEN JBIResponse = 1 THEN 'JBI' 
ELSE CASE WHEN OtherResponse = 1 THEN 'Other' 
END END END END END END END END END END END END AS ChannelPref 
FROM ( SELECT CC.*, 
     MAX(CASE WHEN MTE.DesignVendor = 'MDL' THEN 1 ELSE 0 END) AS MDLResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'Sermo' THEN 1 ELSE 0 END) AS SermoResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'BioPharmCommunications' THEN 1 ELSE 0 END) AS BioPharmResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'Medscape' THEN 1 ELSE 0 END) AS MedscapeResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'PharmaConnect' THEN 1 ELSE 0 END) AS PharmaConnectResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'Targeted Healthcare' THEN 1 ELSE 0 END) AS THResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'PCYC' THEN 1 ELSE 0 END) AS PCYCResponse, 
     MAX(CASE WHEN MTE.DesignVendor = 'JBI' THEN 1 ELSE 0 END) AS JBIResponse, 
     MAX(CASE WHEN MTE.DesignVendor NOT IN ('MDL','Sermo', 'BioPharmCommunications', 'Medscape', 'PharmaConnect', 
               'Targeted Healthcare', 'PCYC', 'JBI') THEN 1 ELSE 0 END) AS OtherResponse 
     --SELECT DISTINCT MTE.CHANNELNAME 
     FROM slice_CampaignContact CC 
     --LEFT JOIN slice_MktgTactic MTI ON I.MktgTacticID = MTI.MktgTacticID AND I.SliceDate = MTI.SliceDate 
     LEFT JOIN slice_Engagements E ON CC.ContactID = E.ContactID AND CC.SliceDate = E.SliceDate 
     LEFT JOIN slice_MktgTactic MTE ON E.MktgTacticID = MTE.MktgTacticID AND E.SliceDate = MTE.SliceDate 
     GROUP BY CC.SliceDate, CC.BrandCd, CC.ContactID, CC.SyncID, CC.FirstName, CC.LastName, CC.CampaignName, 
     ClientSegment, ControlSegmentName) SUB 

Answer 1

你不需要ELSE CASE每次 - 這只是CASE的工作方式 - 每個WHEN只在以前的WHEN失敗時被檢查。像這樣：

SELECT SUB.*, 
CASE 
    WHEN PCYCResponse + JBIResponse > 1 THEN 'SF Multi' 
    WHEN MDLResponse + SermoResponse + BioPharmResponse + MedscapeResponse + PharmaConnectResponse + THResponse + OtherResponse > 1 THEN 'MCM Multi' 
    WHEN MDLResponse + SermoResponse + BioPharmResponse + MedscapeResponse + PharmaConnectResponse + THResponse + PCYCResponse + JBIResponse + OtherResponse > 1 THEN 'SF & MCM Multi' 
    WHEN MDLResponse + SermoResponse + BioPharmResponse + MedscapeResponse + PharmaConnectResponse + THResponse + PCYCResponse + JBIResponse + OtherResponse = 0 THEN 'None' 
    WHEN MDLResponse = 1 THEN 'MDL' 
    WHEN SermoResponse = 1 THEN 'Sermo' 
    WHEN BioPharmResponse = 1 THEN 'BioPharmCommunications' 
    WHEN MedscapeResponse = 1 THEN 'Medscape' 
    WHEN PharmaConnectResponse = 1 THEN 'PharmaConnect' 
    WHEN THResponse = 1 THEN 'Targeted Healthcare' 
    WHEN PCYCResponse = 1 THEN 'PCYC' 
    WHEN JBIResponse = 1 THEN 'JBI' 
    WHEN OtherResponse = 1 THEN 'Other' 
    ELSE 'Woah, nothing matched' 
END AS ChannelPref 
FROM ( SELECT CC.*, -- etc