SQL Server 2005一个查询计算两个表

Question

I'm beginner in SQL Server

I have three tables in Database hospital

1. PatientFiles
2. OtherServices
3. PatientDeposit

Two queries to display my result

• Query Number One. Display PatientFilesID, TotalOtherServices

   SELECT pf.ID AS PatientFileID, SUM(os.Quantum * os.Price) AS TotalOtherServices FROM PatientsFiles pf INNER JOIN OtherServices os ON pf.ID = os.Patient_File_ID WHERE pf.ID = '14' GROUP BY pf.ID 

It is true result

    PatientFileID  | TotalOtherServices
        14                194.00

• Query Number Two. Display PatientFilesID, TotalPatientDeposit

   SELECT pd.Patient_File_ID AS PatientFileID, SUM(pd.Deposit) AS TotalPatientDeposit FROM PatientsDeposits pd WHERE pd.Patient_File_ID = '14' GROUP BY pd.Patient_File_ID 

It is true result

    PatientFileID | TotalPatientDeposit
        14               450.00

• My very tired to mix two queries

   SELECT pf.ID AS PatientFileID, SUM(os.Quantum * os.Price) AS TotalOtherServices, SUM(pd.Deposit) AS TotalPatientDeposit FROM PatientsFiles pf INNER JOIN OtherServices os ON pf.ID = os.Patient_File_ID INNER JOIN PatientsDeposits pd ON pf.ID = pd.Patient_File_ID WHERE pf.ID = '14' GROUP BY pf.ID 

It is false result

    PatientFileID  | TotalOtherServices | TotalPatientDeposit
         14                  582.00         1350.00

Thank you for help me in advance

Answer 1

Select pf.ID as PatientFileID,
    os.TotalOtherServices,
    pd.TotalDeposit
From PatientFiles pf
    Left Join
 (Select Patient_File_ID as PatientfileID, SUM(os.Quantum * os.Price) AS TotalOtherServices
  From OtherServices Group By Patient_File_ID) os on pf.PatientFileID = os.PatientFileID
    Left Join
 (Select Patient_File_ID AS PatientFileID, SUM(Deposit) AS TotalPatientDeposit
  From PatientsDeposits Group By Patient_File_ID) pd on pf.PatientFileID = pd.PatientFileID

Answer 2

At a quick glance, it looks like the values are 3 times bigger than expected.
(194 * 3 = 582, 450 * 3 = 1350).

Also, in your 2nd query you aren't using a INNER JOIN .

SELECT pf.ID AS PatientFileID, 
SUM(pd.Deposit) AS TotalPatientDeposit
FROM PatientsFiles pf INNER JOIN PatientsDeposits pd
ON pf.ID = pd.Patient_File_ID
WHERE pd.Patient_File_ID = '14'
GROUP BY pd.Patient_File_ID

I know that this is not the answer & more of things that should be checked.