替換SQL中的空白單元格？

出於某種原因，當這是0它不會說0或甚至給一個空值，它只是沒有返回任何東西（附加屏幕截圖）替換SQL中的空白單元格？

我怎樣才能得到這個返回0呢？有人可以解釋爲什麼會發生這種情況嗎？

select 
    cast(PatientClass as varchar) + ' - ' + cast([Counted] as varchar) [Procedures Split] 
from 
    (select 
     PatientClass, COUNT(*) as [Counted] 
    from 
     (SELECT      
       NELCal.LastDayOfWeek, S.FaciltyID, 
       PP.EncounterRecno, PP.ProcedureSequence, 
       S.[AdmissionDate], S.AdmissionConsultantName, S.AdmissionMethod, 
       s.LengthOfSpell, 
       year(S.[AdmissionDate]) as AdmYear, 
       month(S.[AdmissionDate]) as AdmMonth, 
       PP.[ProcedureDate], 
       year(PP.[ProcedureDate]) as ProcYear, 
       month(PP.[ProcedureDate]) as ProcMonth, 
       S.Age, S.[AdmissionSpecialty(Function)], 
       S.[PatientClass], s.[AdmissionSpecialty(Main)], 
       PP.[ProcedureCode], PP.[Procedure] 
      FROM 
       [WHREPORTING].[APC].[Spell] S     
      LEFT JOIN 
       [WHREPORTING].[APC].[Episode] E ON S.SourceSpellNo = E.SourceSpellNo     
      LEFT JOIN 
       [WHREPORTING].[APC].[AllProcedures] PP ON E.EpisodeUniqueID = PP.EpisodeSourceUniqueID 
      LEFT JOIN 
       WHREPORTING.APC.Patient P ON P.EncounterRecno = S.EncounterRecno 
      JOIN 
       WHREPORTING.LK.Calendar AS NELCal ON PP.ProcedureDate = NELCal.TheDate      
               AND pp.ProcedureDate between '05 dec 2016' and '06 dec 2016'    
      --and NELCal.LastDayOfWeek between DATEADD(DAY,-7*52,cast(GETDATE() as DATE))     
      --and DATEADD(DAY,-1,cast(GETDATE() as DATE))     
      WHERE     
       [AdmissionSpecialty(Function)] = 'Breast Surgery') f   
    group by 
     PatientClass) g

來源

2016-12-06 jd8766

這可能是因爲你已經有了一個GROUP BY，但有可能是沒什麼組 - 如果你將組帶走，是否有行要分組？ – Cato

您正在調用可能不包含任何記錄的派生表上的COUNT聚合;這將導致沒有返回。 – Chriz

您需要選擇您感興趣的所有不同'PatientClass'，然後將其添加到您選擇的所有記錄中，然後計算右邊的表（可能爲空 - 不計算空值），則可以獲得零對於零行「PatientClass」 - 卡託剛纔 – Cato

您可以用case statment做到這一點

CASE WHEN yourfield = '' THEN 0 ELSE yourfield

如果沒有記錄在所有返回，你能做到這一點

IF NOT EXISTS(select 
    cast(PatientClass as varchar) + ' - ' + cast([Counted] as varchar) [Procedures Split] 
from 
    (select 
     PatientClass, COUNT(*) as [Counted] 
    from 
     (SELECT      
       NELCal.LastDayOfWeek, S.FaciltyID, 
       PP.EncounterRecno, PP.ProcedureSequence, 
       S.[AdmissionDate], S.AdmissionConsultantName, S.AdmissionMethod, 
       s.LengthOfSpell, 
       year(S.[AdmissionDate]) as AdmYear, 
       month(S.[AdmissionDate]) as AdmMonth, 
       PP.[ProcedureDate], 
       year(PP.[ProcedureDate]) as ProcYear, 
       month(PP.[ProcedureDate]) as ProcMonth, 
       S.Age, S.[AdmissionSpecialty(Function)], 
       S.[PatientClass], s.[AdmissionSpecialty(Main)], 
       PP.[ProcedureCode], PP.[Procedure] 
      FROM 
       [WHREPORTING].[APC].[Spell] S     
      LEFT JOIN 
       [WHREPORTING].[APC].[Episode] E ON S.SourceSpellNo = E.SourceSpellNo     
      LEFT JOIN 
       [WHREPORTING].[APC].[AllProcedures] PP ON E.EpisodeUniqueID = PP.EpisodeSourceUniqueID 
      LEFT JOIN 
       WHREPORTING.APC.Patient P ON P.EncounterRecno = S.EncounterRecno 
      JOIN 
       WHREPORTING.LK.Calendar AS NELCal ON PP.ProcedureDate = NELCal.TheDate      
               AND pp.ProcedureDate between '05 dec 2016' and '06 dec 2016'    
      --and NELCal.LastDayOfWeek between DATEADD(DAY,-7*52,cast(GETDATE() as DATE))     
      --and DATEADD(DAY,-1,cast(GETDATE() as DATE))     
      WHERE     
       [AdmissionSpecialty(Function)] = 'Breast Surgery') f   
    group by 
     PatientClass) g) 

SELECT 0 AS [Procedures Split] 
ELSE 
select 
    cast(PatientClass as varchar) + ' - ' + cast([Counted] as varchar) [Procedures Split] 
from 
    (select 
     PatientClass, COUNT(*) as [Counted] 
    from 
     (SELECT      
       NELCal.LastDayOfWeek, S.FaciltyID, 
       PP.EncounterRecno, PP.ProcedureSequence, 
       S.[AdmissionDate], S.AdmissionConsultantName, S.AdmissionMethod, 
       s.LengthOfSpell, 
       year(S.[AdmissionDate]) as AdmYear, 
       month(S.[AdmissionDate]) as AdmMonth, 
       PP.[ProcedureDate], 
       year(PP.[ProcedureDate]) as ProcYear, 
       month(PP.[ProcedureDate]) as ProcMonth, 
       S.Age, S.[AdmissionSpecialty(Function)], 
       S.[PatientClass], s.[AdmissionSpecialty(Main)], 
       PP.[ProcedureCode], PP.[Procedure] 
      FROM 
       [WHREPORTING].[APC].[Spell] S     
      LEFT JOIN 
       [WHREPORTING].[APC].[Episode] E ON S.SourceSpellNo = E.SourceSpellNo     
      LEFT JOIN 
       [WHREPORTING].[APC].[AllProcedures] PP ON E.EpisodeUniqueID = PP.EpisodeSourceUniqueID 
      LEFT JOIN 
       WHREPORTING.APC.Patient P ON P.EncounterRecno = S.EncounterRecno 
      JOIN 
       WHREPORTING.LK.Calendar AS NELCal ON PP.ProcedureDate = NELCal.TheDate      
               AND pp.ProcedureDate between '05 dec 2016' and '06 dec 2016'    
      --and NELCal.LastDayOfWeek between DATEADD(DAY,-7*52,cast(GETDATE() as DATE))     
      --and DATEADD(DAY,-1,cast(GETDATE() as DATE))     
      WHERE     
       [AdmissionSpecialty(Function)] = 'Breast Surgery') f   
    group by 
     PatientClass) g

來源

2016-12-06 14:10:05

嗨，我試過這個，但它仍然沒有給我什麼迴應？ – jd8766

在這種情況下，沒有記錄我會更新我的答案 –

幾乎加倍服務器的工作。 –

我猜測，一個的子查詢沒有返回任何記錄。這意味着你的結果集將完全清空（甚至不爲空）。

如果結果爲空，則無法使用字段（即您的演員陳述）。首先，您需要檢查IF EXISTS ...

來源

2016-12-06 14:21:03 Ash8087

最簡單的辦法是使用合併功能類似這樣：

select Coalesce(Table.Field,0) as columnResult

來源

2016-12-06 15:04:52

替換SQL中的空白單元格？

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