Question

我正在尝试根据case语句编写where子句。我正在获得一个多部分标识符＆＃34; k.Author＆＃34;无法绑定。

我做了一些研究，发现在Case语句之前处理了where子句，所以我将case语句放在一个子查询中。子查询以K结尾，列以作者结束。

有人可以帮助我弄清楚如何让这个工作。我只希望列显示K.Author =＆＃39;协调员1，推荐人的位置。

错误

Msg 4104, Level 16, State 1, Line 42
The multi-part identifier "k.Author" could not be bound.

SQL查询

SELECT MCON.MailHeader_DateSent,
       VP.Person_Name AS [Patient Name],
       MCON.MailHeader_Subject,
       COUNT(MCON.MailHeader_ID) AS [Inboxed Mesage]
       MTA.MailDetail_Folder,
       EP.Person_Name AS [To],
       N.Note_DateOccurred,
       CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)), --Missing a Column Alias here
       CASE WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%ashlee%' THEN 'Ashlee ' + CHAR(10) + 'Castro' --I have assumed the line break mid name is meant to be there
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%cordova%' THEN 'Adrian ' + CHAR(10) + 'Cordova'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%lyndsay%' THEN 'Lyndsay ' + CHAR(10) + 'Frommer'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Lyndsay%' THEN 'Lyndsay ' + CHAR(10) + 'Frommer'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%rivera%' THEN 'Rivera ' + CHAR(10) + 'Margaret'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Margaret%' THEN 'Rivera ' + CHAR(10) + 'Margaret'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Jtroy%' THEN 'Jennifer ' + CHAR(10) + 'Troy'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Adrian C%' THEN 'Adrian ' + CHAR(10) + 'Cordova'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Ann B%' THEN 'Ann ' + CHAR(10) + 'Burdge'
            ELSE 'N/A' 
      END AS [Referal Agent],
      (SELECT CASE WHEN CAST(CN.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Coordinator 1, ' + CHAR(10) + 'Referrals%' THEN 'Coordinator 1, Referrals' --Assumed same about line break here
                   ELSE 'Not A Referral Note'
              END AS 'Author'  
      FROM CHRT_Note CN) AS k
FROM MSG_MailHeader MH
     JOIN MSG_MailDetail MD on MCON.MailHeader_ID = MTA.MailHeader_ID
     JOIN ENTY_Person EP on MTA.Entity_ID  = EP.Entity_ID
     JOIN TASK_TaskAttachment TA on MCON.MailHeader_ID = TA.MailHeader_ID
     JOIN View_Patient VP on TA.Patient_ID = VP.Patient_ID
     JOIN CHRT_Visit CV on VP.Patient_ID = CV.Patient_ID
     JOIN CHRT_VisitCPT CVC on CV.Note_ID = CVC.Note_ID
     JOIN CHRT_OtherNote CON on TA.Patient_ID = CON.Patient_ID
     JOIN CHRT_Note N on CON.Note_ID = N.Note_ID
WHERE MTA.MailDetail_Folder = 3 
  AND MCON.MailHeader_DateSent BETWEEN '1/22/2018' AND '1/22/2018 23:59:59' 
  AND EP.Person_Name = 'Coordinator 1, Referrals'
  AND CVC.VisitCPT_Code IN  (...RemoveTA.. For example)
  AND N.Note_DateOccurred > MCON.MailHeader_DateSent
  AND k.Author = 'Coordinator 1, Referrals'
GROUP BY VP.Person_Name,
         MCON.MailHeader_DateSent,
         MTA.MailDetail_FolderP.Person_Name,
         N.Note_DateOccurred,
         MCON.MailHeader_Subject,
         CAST(N.Note_SummaryRTF AS NVARCHAR(MAX));

Answer 1

好的，既然我已经把SQL写成了可读的东西，是的，其他的是正确的，你没有一个名为或别名k的表。但是，您确实有一个别名为k的列（您无法通过别名在WHERE子句中引用该列。）

其他人再次使用CROSS APPLY。因此，你最终得到了这个：

SELECT MCON.MailHeader_DateSent,
       VP.Person_Name AS [Patient Name],
       MCON.MailHeader_Subject,
       COUNT(MCON.MailHeader_ID) AS [Inboxed Mesage]
       MTA.MailDetail_Folder,
       EP.Person_Name AS [To],
       N.Note_DateOccurred,
       CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)), --Missing a Column Alias here
       CASE WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%ashlee%' THEN 'Ashlee ' + CHAR(10) + 'Castro' --I have assumed the line break mid name is meant to be there
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%cordova%' THEN 'Adrian ' + CHAR(10) + 'Cordova'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%lyndsay%' THEN 'Lyndsay ' + CHAR(10) + 'Frommer'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Lyndsay%' THEN 'Lyndsay ' + CHAR(10) + 'Frommer'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%rivera%' THEN 'Rivera ' + CHAR(10) + 'Margaret'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Margaret%' THEN 'Rivera ' + CHAR(10) + 'Margaret'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Jtroy%' THEN 'Jennifer ' + CHAR(10) + 'Troy'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Adrian C%' THEN 'Adrian ' + CHAR(10) + 'Cordova'
            WHEN CAST(N.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Ann B%' THEN 'Ann ' + CHAR(10) + 'Burdge'
            ELSE 'N/A' 
      END AS [Referal Agent],

FROM MSG_MailHeader MH
     JOIN MSG_MailDetail MD on MCON.MailHeader_ID = MTA.MailHeader_ID
     JOIN ENTY_Person EP on MTA.Entity_ID  = EP.Entity_ID
     JOIN TASK_TaskAttachment TA on MCON.MailHeader_ID = TA.MailHeader_ID
     JOIN View_Patient VP on TA.Patient_ID = VP.Patient_ID
     JOIN CHRT_Visit CV on VP.Patient_ID = CV.Patient_ID
     JOIN CHRT_VisitCPT CVC on CV.Note_ID = CVC.Note_ID
     JOIN CHRT_OtherNote CON on TA.Patient_ID = CON.Patient_ID
     JOIN CHRT_Note N on CON.Note_ID = N.Note_ID
     CROSS APPLY (SELECT CASE WHEN CAST(ca.Note_SummaryRTF AS NVARCHAR(MAX)) LIKE '%Coordinator 1, ' + CHAR(10) + 'Referrals%' THEN 'Coordinator 1, Referrals' --Assumed same about line break here
                              ELSE 'Not A Referral Note'
                         END AS Author
                   FROM CHRT_Note ca) AS CNca
WHERE MTA.MailDetail_Folder = 3 
  AND MCON.MailHeader_DateSent BETWEEN '1/22/2018' AND '1/22/2018 23:59:59' 
  AND EP.Person_Name = 'Coordinator 1, Referrals'
  AND CVC.VisitCPT_Code IN  (...RemoveTA.. For example)
  AND N.Note_DateOccurred > MCON.MailHeader_DateSent
  AND CNca.Author = 'Coordinator 1, Referrals'
GROUP BY VP.Person_Name,
         MCON.MailHeader_DateSent,
         MTA.MailDetail_FolderP.Person_Name,
         N.Note_DateOccurred,
         MCON.MailHeader_Subject,
         CAST(N.Note_SummaryRTF AS NVARCHAR(MAX));

注意，我已经更改了别名。使用别名时，请使用具有代表性的内容。调用表格a，然后下一个b，下一个c等，对任何人都没有帮助。任何查看您的查询的人都必须查看您的WHERE子句，以便在每次看到别名时找出别名（不只是一次扫描）。如果您有3个名为Customer，Sale和CustomerSale的表，则分别为C，S和CS添加别名，通过您的解决方案坚持这些别名。那些别名实际上意味着什么。

否则，Customer在一个查询中可能是a，因为它是您FROM子句中的第一个表，但c甚至是e。，因为它是第3或第5。

SQL语句 - 尝试将where子句基于case语句

1 个答案: