Question

我有以下两个查询组成的两个表：

SELECT t3.PatientID, SUM(t3.Fee) as total FROM     
(SELECT t1.TestID, t2.PatientID, t1.Fee FROM    
(SELECT Test.TestID, Test.Fee FROM MedicalTest AS Test) AS t1,    
(SELECT T.TestID, T.PatientID FROM Take AS T) AS t2    
WHERE t1.TestID = t2.TestID    
ORDER BY t2.PatientID) AS t3        
GROUP BY t3.PatientID    
ORDER BY total DESC;

哪个给我一张患者ID表格以及他们在测试上花费了多少钱，该表格的一部分看起来像这样：

PATIENTID   TOTAL                            
----------- ---------------------------------
99642131                            550.00
99631255                            440.00
99665378                            430.00
99627956                            310.00
99657423                            280.00
99641125                            260.00
99630025                            230.00
99648682                            230.00

我的其他查询：

SELECT DISTINCT D.PatientID FROM Diagnose AS D     
WHERE D.PhysicianID IN (    
SELECT P.PhysicianID FROM Physician AS P    
WHERE P.HName = 'Specific Hospital'    
AND P.DName = 'Intensive Care Unit');

返回给我由特定医生护理的患者ID的列表。表格的一部分：

PATIENTID  
-----------
99615376
99618797
99620783
99620882
99621221

我正在尝试创建一个结果表，其中包含第二个表中的患者ID以及他们在第一个表中的医学检查上花费了多少。在这种情况下，第二张表中的某些患者没有进行任何检查，我希望该表仅对总列给出0，但是，我尝试合并这些表仅给了我接受过检查的患者：

SELECT t5.PatientID, t4.total FROM

(SELECT t3.PatientID, SUM(t3.Fee) as total FROM
(SELECT t1.TestID, t2.PatientID, t1.Fee FROM
(SELECT Test.TestID, Test.Fee FROM MedicalTest AS Test) AS t1,
(SELECT T.TestID, T.PatientID FROM Take AS T) AS t2
WHERE t1.TestID = t2.TestID
ORDER BY t2.PatientID) AS t3
GROUP BY t3.PatientID
ORDER BY total DESC) AS t4,

(SELECT DISTINCT D.PatientID FROM Diagnose AS D
WHERE D.PhysicianID IN (
SELECT P.PhysicianID FROM Physician AS P
WHERE P.HName = 'Specific Hospital'
AND P.DName = 'Intensive Care Unit')) AS t5

WHERE t5.PatientID = t4.PatientID;

结果表：

PATIENTID   TOTAL                            
----------- ---------------------------------
99642131                            550.00
99665378                            430.00
99627956                            310.00

如何将表2中未参加测试的患者包括在内，并在其总列中输入0？

Answer 1

我设法编写了以下查询：

SELECT DISTINCT D.PatientID, COALESCE(total, '0') AS finalTotal
FROM Diagnose AS D
LEFT JOIN (
SELECT T.PatientID, SUM(M.Fee) AS total
FROM Take AS T, MedicalTest AS M
WHERE T.TestID = M.TestID
GROUP BY T.PatientID
          ) AS t1
ON t1.PatientID = D.PatientID
WHERE D.PhysicianID IN (
SELECT P.PhysicianID FROM Physician AS P
WHERE P.HName = 'Specific Hospital'
AND P.DName = 'Intensive Care Unit')
ORDER BY finalTotal DESC;

我将COALESCE(total, '0')与LEFT JOIN一起使用，在没有进行医学检查的行上输入0。这将我引向所需的输出：

PATIENTID   FINALTOTAL                                
----------- ------------------------------------------
99642131                                     550.00
99665378                                     430.00
99627956                                     310.00
99615376                                          0
99618797                                          0
99620783                                          0
99620882                                          0
99621221                                          0
99642157                                          0
99655482                                          0
99664061                                          0

合并两个表（包括在其他表中找不到的行），替换列

1 个答案: