MS SQL合併兩個查詢以獲得一個結果

Question

我正在實施車輛管理系統。我有兩個不同的疑問，一個是提取一個機構的所有車輛，另一個是提取司機。每輛車都有一個分配給它的駕駛員。 現在我想合併這兩個查詢來返回車輛詳細信息以及分配給車輛的驅動程序的詳細信息。

1查詢來獲取司機和他們的名字：

SELECT UserInfo.Name 
FROM DriverInfo INNER JOIN UserInfo ON DriverInfo.Email = UserInfo.Email 
    INNER JOIN Agency ON UserInfo.AgencyID = Agency.AgencyID 
WHERE (UserInfo.AgencyID = 1) 
ORDER BY DriverInfo.DriverId DESC 

第二查詢來獲取車輛詳細信息：

SELECT Vehicle.VehicleRegNum AS [Registration Number], 
    Vehicle.EngineNum AS [Engine Number], 
    Vehicle.FileRef AS [File Refrence], 
    Type.Name AS Type, 
    Make.Name AS Make , 
    Vehicle.DriverID AS DriverID 
FROM Vehicle INNER JOIN Type ON Vehicle.Type = Type.TypeId 
    INNER JOIN Make ON Vehicle.Make = Make.MakeId 
WHERE (Vehicle.Approve = 1) 
    AND (Vehicle.AgencyId = 1) 
    AND (Vehicle.Maintained = 1) 
ORDER BY Vehicle.VId DESC 

在此查詢中，我得到了DriverID 並在DriverInfo：

DriverId, LicenseType, AppointmentDate, LicenseExpiryDate, ContractExpiryDate, Email 

Answer 1

只需添加連接中的其他表即可。

SELECT Vehicle.VehicleRegNum AS [Registration Number], 
Vehicle.EngineNum AS [Engine Number], 
Vehicle.FileRef AS [File Refrence], 
Type.Name AS Type, 
Make.Name AS Make, 
DriverInfo.DriverId, 
DriverInfo.LicenseType, 
DriverInfo.AppointmentDate, 
DriverInfo.LicenseExpiryDate, 
DriverInfo.ContractExpiryDate, 
DriverInfo.Email 
FROM Vehicle 
INNER JOIN Type 
    ON Vehicle.Type = Type.TypeId 
INNER JOIN Make 
    ON Vehicle.Make = Make.MakeId 
INNER JOIN DriverInfo 
    ON Vehicle.DriverID = DriverInfo.DriverId 
INNER JOIN UserInfo 
    ON DriverInfo.Email = UserInfo.Email 
INNER JOIN Agency 
    ON UserInfo.AgencyID = Agency.AgencyID 
    AND Vehicle.AgencyID = Agency.AgencyID 
WHERE (Vehicle.Approve = 1) 
AND (Vehicle.AgencyId = 1) 
AND (Vehicle.Maintained = 1) 
ORDER BY Vehicle.VId DESC 

Answer 2

我相信下面的工作，根據您的要求，你可能想改變JOIN類型的DriverInfo：

SELECT Vehicle.VehicleRegNum AS [Registration Number] 
    ,Vehicle.EngineNum AS [Engine Number] 
    ,Vehicle.FileRef AS [File Refrence] 
    ,Type.NAME AS Type 
    ,Make.NAME AS Make 
    ,UserInfo.NAME AS Driver 
FROM Vehicle 
INNER JOIN Type ON Vehicle.Type = Type.TypeId 
INNER JOIN Make ON Vehicle.Make = Make.MakeId 
LEFT JOIN DriverInfo ON DriverInfo.DriverID = Vehicle.DriverID 
LEFT JOIN UserInfo ON DriverInfo.Email = UserInfo.Email 
    AND (UserInfo.AgencyID = 1) 
--Agency is never used, so don't join? 
--LEFT JOIN Agency ON UserInfo.AgencyID = Agency.AgencyID 
WHERE (Vehicle.Approve = 1) 
    AND (Vehicle.AgencyId = 1) 
    AND (Vehicle.Maintained = 1) 
ORDER BY Vehicle.VId DESC