将嵌套JSON作为输出的SQL脚本

考虑到我有以下数据

create table #Temp(PropertyID nvarchar(255),BuildingID nvarchar(255),UnitID nvarchar(255),TenantName nvarchar(255),FieldName nvarchar(255),CurrentValue nvarchar(255),PreviousValue nvarchar(255))

insert into #Temp Values
('p1','B1','5','Spencer','Lease_EndDate','01/01/2021','03/01/2021'),
('p1','B1','5','Spencer','MonthlyBaseRent','3232','3000'),
('p1','B1','5','BCR','MonthlyBaseRent','1000','1100'),
('p1','B1','6','EA','MonthlyBaseRent','5000','5100'),
('p1','B2','5','VR','MonthlyBaseRent','3232','3000'),*

我需要以下嵌套JSON格式的输出，但我得到的是类似[{}，{}，{}]的平面JSON

[
    {
        "PropertyID": "p1",
        "Building": [
            {
                "BuildingID": "B1",
                "Unit": [
                    {
                        "UnitID": "5",
                        "Tenant": [
                            {
                                "TenantName": "Spencer",
                                "Lease_EndDate": {
                                    "CurrentValue": "01/01/2021",
                                    "PreviousValue": "03/01/2021"
                                },
                                "MonthlyBaseRent": {
                                    "CurrentValue": "3232",
                                    "PreviousValue": "3000"
                                }
                            },
                            {
                                "TenantName": "BCR",
                                "MonthlyBaseRent": {
                                    "CurrentValue": "1000",
                                    "PreviousValue": "1100"
                                }
                            }
                        ]
                    },
                    {
                        "UnitID": "6",
                        "Tenant": [
                            {
                                "TenantName": "EA",
                                "MonthlyBaseRent": {
                                    "CurrentValue": "5000",
                                    "PreviousValue": "5100"
                                }
                            }
                        ]
                    }
                ]
            },
            {
                "BuildingID": "B2",
                "Unit": [
                    {
                        "UnitID": "5",
                        "Tenant": [
                            {
                                "TenantName": "VR",
                                "MonthlyBaseRent": {
                                    "CurrentValue": "3232",
                                    "PreviousValue": "3000"
                                }
                            }
                        ]
                    }
                ]
            }
        ]
    }
]

---

这是一个嵌套JSON的示例，有两个级别。使用此模板可以根据需要构建尽可能多的级别

select PropertyID ,BuildingID, 
  (select UnitID ,
     (select t1.TenantName, t1.FieldName, t1.CurrentValue,t1.PreviousValue
     from #Temp t1
     where t1.PropertyID = t2.PropertyID and t1.BuildingID = t2.BuildingID and t1.UnitID = t2.UnitID
     for json path) Tenant
  from  #Temp t2
  where t2.PropertyID = t3.PropertyID and t2.BuildingID = t3.BuildingID
  group by UnitID, PropertyID ,BuildingID 
  for json path) Unit
from  #Temp t3
group by PropertyID ,BuildingID 
for json path

---

假设我像下面那样插入空值，上面的脚本跳过这些值。（'p1'，'B1'，null，null，null，'TotalRent'，'5000'，'5100'），（'p1'，null，null，null，'BuildingID'，'B3'，null）它应该是，[{“PropertyID”：“p1”，“Building”：[{“Building_Id”：“B1”，“TotalRent”：{“CurrentValue”：“5000”，“PreviousValue”：“5000”}，{“Building_Id”：{“CurrentValue”：“B3”，“PreviousValue”：null}}]@pts，使用