Sybase SQL - 從查詢結果中刪除「半副本」

我有一個查詢使用兩個SELECT語句組合使用UNION ALL。這兩個語句都從相似的表中抽取數據來填充查詢結果。我正在嘗試從查詢中刪除「半重複」行，但遇到問題。Sybase SQL - 從查詢結果中刪除「半副本」

我的查詢如下：

SELECT DISTINCT * 
FROM 
    (
    SELECT 
     TeamNum = CASE 
       WHEN T.TeamName = 'Alpha Team' 
        THEN '1' 
       WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') 
        THEN '2' 
       WHEN T.TeamName = 'Delta Team' 
        THEN '3' 
       ELSE '<Undefined>' 
       END, 
     P.PatientLastName AS LastName, 
     P.PatientFirstName AS FirstName, 
     R.PrimaryCity AS City, 
     ReimbursorName = CASE 
       WHEN RE.ReimbursorDescription = 'Medicare' 
        Then 'R1' 
       WHEN RE.ReimbursorDescription = 'Medicaid' 
        Then 'R2' 
       ELSE 'R3' 
       END, 
     P.PatientID AS PatientID 
    FROM 
     PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, 
     Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, 
     PatReferrals PR LEFT OUTER JOIN PatReimbursors PRE ON PR.PatientID = PRE.PatientID, 
     PatReimbursors PRE LEFT OUTER JOIN Reimbursors RE ON PRE.ReimbursorID = RE.ReimbursorID, 
     PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID, 
    WHERE 
     PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 
     AND PR.Status <> 'R' 
     AND PRE.CoveragePriority = '1' 
     AND PRE.ExpirationDate IS NULL 

    UNION ALL 

    SELECT 
     TeamNum = CASE 
       WHEN T.TeamName = 'Alpha Team' 
        THEN '1' 
       WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') 
        THEN '2' 
       WHEN T.TeamName = 'Delta Team' 
        THEN '3' 
       ELSE '<Undefined>' 
       END, 
     P.PatientLastName AS LastName, 
     P.PatientFirstName AS FirstName, 
     R.PrimaryCity AS City, 
     ReimbursorName = CASE 
       WHEN RE.ReimbursorDescription = 'Medicare' 
        Then 'E1' 
       WHEN RE.ReimbursorDescription = 'Medicaid' 
        Then 'E2' 
       ELSE 'E3' 
       END, 
     P.PatientID AS PatientID 
    FROM 
     PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, 
     Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, 
     PatReferrals PR LEFT OUTER JOIN PatEligibilities PE ON PR.PatientID = PE.PatientID, 
     PatEligibilities PE LEFT OUTER JOIN Reimbursors RE ON PE.ReimbursorID = RE.ReimbursorID, 
     PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID, 
    WHERE 
     PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 
     AND PR.Status <> 'R' 
     AND PE.Status <> 'V' 
     AND PE.ApplicationDate BETWEEN DATE(PR.ReferralDate)-5 AND DATE('2100/01/01') 
    ) 

AS DUMMYTBL 

ORDER BY 
    DUMMYTBL.LastName ASC, 
    DUMMYTBL.FirstName ASC

當我運行查詢，我得到的結果是：基於

3 Doe Jane Town R1 19874 
1 Roe John City R3 50016 
1 Roe John City E1 50016 
2 Smith Jane Town E3 33975

，我需要刪除的數據是重複的行一旦從原始查詢中引入結果，就會按照一定的標準執行。每個人只能被列出一次，他們必須有一個單一的支付來源（R1，R2，R3，E1，E2，E3）。如果存在R＃，則不能爲該人列出E＃。如果沒有R＃，那麼必須列出E＃。如我的示例結果所示，第2行和第3行列出了同一個人，但是有兩個付款來源（R3和E1）。

我怎樣才能讓每個人只有一行顯示使用我列出的標準？

編輯：修改SQL查詢以顯示WHERE子句中的原始變量，以顯示查詢的更多詳細信息。 PatReimbursors和PatEligibilities表具有相似的數據，但標準不同以便提取正確的數據。

來源

2013-03-21 Mr Xaero

'TeamNum = T.TeamName，'？這是一個錯字嗎？ – Rachcha 2013-03-21 15:55:59

這是一個真正的查詢嗎？ 'from'子句似乎有多個相同別名的出現 - 看起來好像它永遠不會運行。另外，如果有多個「R」來源，哪個要優先？ – 2013-03-21 15:59:46

@Rachcha - 我縮短了查詢的部分內容，因爲它最初是一個'CASE'語句，可以從'TeamName'返回數字。 @Mark Bannister - 是的，這個查詢確實有效。 – 2013-03-21 16:00:01

您的查詢沒有意義。我將首先消除條款中產生的隱式笛卡爾積。

我的猜測是，從條款應該是：

FROM 
    PatReferrals PR LEFT JOIN 
    Patient P 
    ON PR.PatientID = P.PatientID left outer join 
    Rolodex R 
    ON P.RolodexID = R.RolodexID left outer join 
    PatEligibilities PE 
    ON PR.PatientID = PE.PatientID left outer join 
    Reimbursors RE 
    ON PE.ReimbursorID = RE.ReimbursorID left outer join 
    Teams T ON PR.TeamID = T.TeamID

一旦你這樣做，你可能不需要union all或select distinct。您可能能夠同時查詢報銷員和資格。

來源

2013-03-21 15:56:18

PatReferrals表分派給PatReimbursors和PatEligibilities。爲了讓兩個值填充到同一個查詢中，必須插入兩個相似'SELECT'語句的'UNION'。沒有這些，我會從PatReimbursors或PatEligibilities獲取數據，但不是兩者。 – 2013-03-21 17:30:06

這很好。這阻止了一種類型的笛卡爾產品。但是，通過在'from'子句中包含「，」來引入多個其他人。 – 2013-03-21 17:32:41

使用子查詢或子查詢。

Select Distinct [Person Data] 
From PersonTable 
    left Join to otherTable1 -- add outer join for each table you need data from 
     On [Conditions that ensure join can generate only one row per person, 
       ... and specify which of possibly many rows to get...]

確認條件消除任何可能的加入，從其他[外]每人行表產生多行：

總體查詢應採用以下模式被寫入人桌，。這可能是（而且經常）要求的連接條件是基於一個子查詢，例如...

Select Distinct [Person Data] 
From PersonTable p 
    left Join to employments e -- add outer join for each table you need data from 
     On e.PersonId = p.PersonId 
      and e.HireDate = (Select Max(hiredate) from employments 
           where personId = p.PersonId)

來源

2013-03-21 16:00:20

這個工作了相當長的一段時間後的今天，我發現了一個解決問題我有。這是解決方案，並拉動我需要的正確信息：

SELECT DISTINCT 
    TeamNum, 
    LastName, 
    FirstName, 
    City, 
    ReimbursorName = CASE 
     WHEN max(ReimbursorName) IN ('R1', 'E1') 
      THEN '1' 
     WHEN max(ReimbursorName) IN ('R2', 'E2') 
      THEN '2' 
     ELSE '3' 
     END, 
    PatientID 
FROM 
    (
    SELECT 
     TeamNum = CASE 
       WHEN T.TeamName = 'Alpha Team' 
        THEN '1' 
       WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') 
        THEN '2' 
       WHEN T.TeamName = 'Delta Team' 
        THEN '3' 
       ELSE '<Undefined>' 
       END, 
     P.PatientLastName AS LastName, 
     P.PatientFirstName AS FirstName, 
     R.PrimaryCity AS City, 
     ReimbursorName = CASE 
       WHEN RE.ReimbursorDescription = 'Medicare' 
        Then 'R1' 
       WHEN RE.ReimbursorDescription = 'Medicaid' 
        Then 'R2' 
       ELSE 'R3' 
       END, 
     P.PatientID AS PatientID 
    FROM 
     PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, 
     Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, 
     PatReferrals PR LEFT OUTER JOIN PatReimbursors PRE ON PR.PatientID = PRE.PatientID, 
     PatReimbursors PRE LEFT OUTER JOIN Reimbursors RE ON PRE.ReimbursorID = RE.ReimbursorID, 
     PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID 
    WHERE 
     PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 
     AND PR.Status <> 'R' 
     AND PRE.CoveragePriority = '1' 
     AND PRE.ExpirationDate IS NULL 

    UNION ALL 

    SELECT 
     TeamNum = CASE 
       WHEN T.TeamName = 'Alpha Team' 
        THEN '1' 
       WHEN T.TeamName IN ('Bravo Team', 'Charlie Team') 
        THEN '2' 
       WHEN T.TeamName = 'Delta Team' 
        THEN '3' 
       ELSE '<Undefined>' 
       END, 
     P.PatientLastName AS LastName, 
     P.PatientFirstName AS FirstName, 
     R.PrimaryCity AS City, 
     ReimbursorName = CASE 
       WHEN RE.ReimbursorDescription = 'Medicare' 
        Then 'E1' 
       WHEN RE.ReimbursorDescription = 'Medicaid' 
        Then 'E2' 
       ELSE 'E3' 
       END, 
     P.PatientID AS PatientID 
    FROM 
     PatReferrals PR LEFT JOIN Patient P ON PR.PatientID = P.PatientID, 
     Patient P LEFT OUTER JOIN Rolodex R ON P.RolodexID = R.RolodexID, 
     PatReferrals PR LEFT OUTER JOIN PatEligibilities PE ON PR.PatientID = PE.PatientID, 
     PatEligibilities PE LEFT OUTER JOIN Reimbursors RE ON PE.ReimbursorID = RE.ReimbursorID, 
     PatReferrals PR FULL OUTER JOIN Teams T ON PR.TeamID = T.TeamID 
    WHERE 
     PR.ReferralDate BETWEEN GETDATE()-4 AND GETDATE()-1 
     AND PR.Status <> 'R' 
     AND PE.Status <> 'V' 
     AND PE.ApplicationDate BETWEEN DATE(PR.ReferralDate)-5 AND DATE('2100/01/01') 
    ) 

AS DUMMYTBL 
GROUP BY 
    TeamNum, 
    LastName, 
    FirstName, 
    City, 
    PatientID 
ORDER BY 
    DUMMYTBL.LastName ASC, 
    DUMMYTBL.FirstName ASC

感謝您提供的所有答覆。

來源

2013-03-21 19:25:46

Sybase SQL - 從查詢結果中刪除「半副本」

回答

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