TQL如何獲得每列最大值

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這是我的第一篇文章，我希望有人可以提供幫助。我希望能夠在嘗試自行解決問題之前理解邏輯。這裏的想法是從左到右顯示特定的註釋（因此LOJ，每個LOJ是不同的註釋），對於每個我想拉最大服務日期的連接，最終將數據滾動到每行一行人。代碼如下，我非常感謝幫助。大部分是自學的，我正在使用SQL Server 2008 R2。此外，如果代碼太多，只是讓我知道它將如何幫助我凝結它，我會這樣做。TQL如何獲得每列最大值

SELECT dbo.tConTESTs.FirstName 
    ,dbo.tConTESTs.LastName 
    ,dbo.tConTESTs.MI 
    ,dbo.tConTESTs.ConTESTID 
    ,dbo.tConTESTs.SSN 
    ,dbo.tConTESTOrganizations.OrganizationID 
    ,dbo.tConTESTOrganizations.AdmitDate 
    ,dbo.tConTESTOrganizations.DischargeDate 
    ,ImprovementNote_1.ImprovementNoteID 
    ,ImprovementNote_1.TemplateID 
    ,ImprovementNote_1.ServiceDate 
    ,ImprovementNote_2.ImprovementNoteID AS Expr1 
    ,ImprovementNote_2.TemplateID AS Expr2 
    ,ImprovementNote_2.ServiceDate AS Expr4 
    ,ImprovementNote_3.ImprovementNoteID AS Expr5 
    ,ImprovementNote_3.TemplateID AS Expr6 
    ,ImprovementNote_3.ServiceDate AS Expr8 
    ,ImprovementNote_4.ImprovementNoteID AS Expr9 
    ,ImprovementNote_4.TemplateID AS Expr10 
    ,ImprovementNote_4.ServiceDate AS Expr12 
    ,ImprovementNote_5.ImprovementNoteID AS Expr13 
    ,ImprovementNote_5.TemplateID AS Expr14 
    ,ImprovementNote_5.ServiceDate AS Expr16 
    ,ImprovementNote_6.ImprovementNoteID AS Expr17 
    ,ImprovementNote_6.TemplateID AS Expr18 
    ,ImprovementNote_6.ServiceDate AS Expr20 
    ,ImprovementNote_7.ImprovementNoteID AS Expr21 
    ,ImprovementNote_7.TemplateID AS Expr22 
    ,ImprovementNote_7.ServiceDate AS Expr24 
    ,ImprovementNote_8.ImprovementNoteID AS Expr25 
    ,ImprovementNote_8.TemplateID AS Expr26 
    ,ImprovementNote_8.ServiceDate AS Expr28 
    ,ImprovementNote_9.ImprovementNoteID AS Expr29 
    ,ImprovementNote_9.TemplateID AS Expr30 
    ,ImprovementNote_9.ServiceDate AS Expr32 
    ,ImprovementNote_10.ImprovementNoteID AS Expr33 
    ,ImprovementNote_10.TemplateID AS Expr34 
    ,ImprovementNote_10.ServiceDate AS Expr36 
    ,ImprovementNote_11.ImprovementNoteID AS Expr37 
    ,ImprovementNote_11.TemplateID AS Expr38 
    ,ImprovementNote_11.ServiceDate AS Expr40 
    ,ImprovementNote_13.ImprovementNoteID AS Expr45 
    ,ImprovementNote_13.TemplateID AS Expr46 
    ,ImprovementNote_13.ServiceDate AS Expr48 
    ,ImprovementNote_14.ImprovementNoteID AS Expr49 
    ,ImprovementNote_14.TemplateID AS Expr50 
    ,ImprovementNote_14.ServiceDate AS Expr52 
    ,ImprovementNote_15.ImprovementNoteID AS Expr53 
    ,ImprovementNote_15.TemplateID AS Expr54 
    ,ImprovementNote_15.ServiceDate AS Expr56 
    ,ImprovementNote_16.ImprovementNoteID AS Expr57 
    ,ImprovementNote_16.TemplateID AS Expr58 
    ,ImprovementNote_16.ServiceDate AS Expr60 
    ,ImprovementNote_17.ImprovementNoteID AS Expr61 
    ,ImprovementNote_17.TemplateID AS Expr62 
    ,ImprovementNote_17.ServiceDate AS Expr64 
    ,ImprovementNote_18.ImprovementNoteID AS Expr65 
    ,ImprovementNote_18.TemplateID AS Expr66 
    ,ImprovementNote_18.ServiceDate AS Expr68 
    ,ImprovementNote_19.ImprovementNoteID AS Expr69 
    ,ImprovementNote_19.TemplateID AS Expr70 
    ,ImprovementNote_19.ServiceDate AS Expr72 
    ,ImprovementNote_20.ImprovementNoteID AS Expr73 
    ,ImprovementNote_20.TemplateID AS Expr74 
    ,ImprovementNote_20.ServiceDate AS Expr76 
FROM dbo.tConTESTs 
INNER JOIN dbo.tConTESTOrganizations ON dbo.tConTESTs.ConTESTID = dbo.tConTESTOrganizations.ConTESTID 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_1 
     ON ImprovementNote_1.ConTESTID = dbo.tConTESTs.ConTESTID 
     AND ImprovementNote_1.TemplateID = 10 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_2 ON ImprovementNote_2.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_2.TemplateID = 13 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_3 ON ImprovementNote_3.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_3.TemplateID = 12 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_4 ON ImprovementNote_4.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_4.TemplateID = 14 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_5 ON ImprovementNote_5.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_5.TemplateID = 49 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_6 ON ImprovementNote_6.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_6.TemplateID = 19 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_7 ON ImprovementNote_7.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_7.TemplateID = 24 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_8 ON ImprovementNote_8.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_8.TemplateID = 25 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_9 ON ImprovementNote_9.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_9.TemplateID = 26 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_10 ON ImprovementNote_10.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_10.TemplateID = 27 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_11 ON ImprovementNote_11.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_11.TemplateID = 36 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_13 ON ImprovementNote_13.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_13.TemplateID = 51 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_14 ON ImprovementNote_14.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_14.TemplateID = 6 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_15 ON ImprovementNote_15.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_15.TemplateID = 7 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_16 ON ImprovementNote_16.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_16.TemplateID = 8 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_17 ON ImprovementNote_17.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_17.TemplateID = 35 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_18 ON ImprovementNote_18.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_18.TemplateID = 18 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_19 ON ImprovementNote_19.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_19.TemplateID = 16 
LEFT JOIN dbo.ImprovementNote AS ImprovementNote_20 ON ImprovementNote_20.ConTESTID = dbo.tConTESTs.ConTESTID 
    AND ImprovementNote_20.TemplateID = 11 
WHERE dbo.tConTESTOrganizations.DischargeDate IS NULL 
    AND dbo.tConTESTOrganizations.OrganizationID IN (2,3) 
    AND dbo.tConTESTs.ConTESTID = 508 
ORDER BY dbo.tConTESTs.LastName

來源

2016-06-13 Andrew Wilmoth

使用ROW_NUMBER（）謝謝你對清除它Siyual，大加讚賞。 –

建議1：如果您的LOJ指定了精確的TemplateID，則不需要在選擇列表中檢索該TemplateID。 –

建議2：使用像'Expression74'這樣的列別名是一個非常糟糕的主意 - 它永遠不會被維護。由於您正在檢索特定模板ID的數據，因此使用描述該模板ID的別名怎麼樣：比如「ImprovementNoteID_template16」。 –

SELECT dbo.tConTESTs.FirstName 
    ,dbo.tConTESTs.LastName 
    ,dbo.tConTESTs.MI 
    ,dbo.tConTESTs.ConTESTID 
    ,dbo.tConTESTs.SSN 
    ,dbo.tConTESTOrganizations.OrganizationID 
    ,dbo.tConTESTOrganizations.AdmitDate 
    ,dbo.tConTESTOrganizations.DischargeDate 
    ,max(ImprovementNote_1.ServiceDate) as [ImprovementNote_1.ServiceDate.Max] 
.... 
group by dbo.tConTESTs.FirstName 
     ,dbo.tConTESTs.LastName 
     ,dbo.tConTESTs.MI 
     ,dbo.tConTESTs.ConTESTID 
     ,dbo.tConTESTs.SSN 
     ,dbo.tConTESTOrganizations.OrganizationID 
     ,dbo.tConTESTOrganizations.AdmitDate 
     ,dbo.tConTESTOrganizations.DischargeDate

如果您需要的最後日期的筆記，然後需要在

來源

2016-06-13 22:28:21 Paparazzi

TQL如何獲得每列最大值

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