爲什麼要在創建臨時表之後使用EXEC？

Question

我創建2個臨時表#ClientsCountForDoctor和#DeathCount：

CREATE TABLE #ClientsCountForDoctor (DoctorCode int, Clients int) 

SELECT 
    Personal.[DoctorCode], Count(Clients.[ClientCode]) AS [Count-Код клиента] 
FROM 
    Personal 
INNER JOIN 
    (Clients INNER JOIN MedicalCard ON Clients.[ClientCode] = MedicalCard.[ClientCode]) ON Personal.[DoctorCode] = MedicalCard.[DoctorCode] 
GROUP BY 
    Personal.[DoctorCode]; 

INSERT INTO #ClientsCountForDoctor 
EXEC nothing 

CREATE TABLE #DeathCount (DoctorCode int, Deaths int) 

SELECT 
    Personal.[DoctorCode], Count(Clients.[ClientCode]) AS [Count-Код клиента] 
FROM 
    Personal 
INNER JOIN 
    (Clients INNER JOIN MedicalCard ON Clients.[ClientCode] = MedicalCard.[ClientCode]) ON Personal.[DoctorCode] = MedicalCard.[DoctorCode] 
GROUP BY 
    Personal.[DoctorCode], MedicalCard.[TreatmentResult] 
HAVING 
    (((MedicalCard.[TreatmentResult])='Смерть')); 

INSERT INTO #DeathCount 
EXEC nothing 

然後我想使用的結果。我應該怎樣做？

SELECT 
    Personal.[DoctorName], 
    #DeathCount.Deaths/#ClientsCountForDoctor.Clients AS [DeathPercent] 
FROM 
    (#ClientsCountForDoctor INNER JOIN Personal ON #ClientsCountForDoctor.[DoctorCode] = Personal.[DoctorCode]) 
INNER JOIN 
    #DeathCount ON Personal.[DoctorCode] = #DeathCount.[DoctorCode]; 

Answer 1

我覺得你需要的是Select Into語法。 It will create the table for you with the selected data inserted at the same time。然後從上次查詢做一個正常的選擇使用創建的表

例：

SELECT col1,col2,.. 
INTO #temp   --Note: this temporary table will be created in the db 
FROM yourTable 

您的疑問：

SELECT Personal.[DoctorCode], 
     Count(Clients.[ClientCode]) AS [Count-Код клиента] 
INTO #ClientsCountForDoctor --NOTE 

FROM Personal INNER JOIN 
(Clients INNER JOIN MedicalCard ON Clients.[ClientCode] = MedicalCard.[ClientCode]) 
      ON Personal.[DoctorCode] = MedicalCard.[DoctorCode] 
GROUP BY Personal.[DoctorCode]; 


SELECT Personal.[DoctorCode], 
     Count(Clients.[ClientCode]) AS [Count-Код клиента] 
#DeathCount --NOTE 

FROM Personal INNER JOIN 
    (Clients INNER JOIN MedicalCard ON Clients.[ClientCode] = MedicalCard.[ClientCode]) 
      ON Personal.[DoctorCode] = MedicalCard.[DoctorCode] 
GROUP BY Personal.[DoctorCode], MedicalCard.[TreatmentResult] 
HAVING (((MedicalCard.[TreatmentResult])='Смерть')); 


SELECT p.[DoctorName], d.Deaths/c.Clients AS [DeathPercent] 
FROM #ClientsCountForDoctor c INNER JOIN Personal p 
    ON c.[DoctorCode] = p.[DoctorCode] 
      INNER JOIN #DeathCount d 
    ON p.[DoctorCode] = d.[DoctorCode];