Presenting hierarchical data with different conditions using joins in SQL Server 2012 - tsql

Question

I have two tables. In one table my raw data and in other table the relationships as below
Declare #Emp table(EmpId int,EmpName Varchar(100),CITY VARCHAR(100),Designation Varchar(100),ReportingManager Int)
INSERT INTO #Emp
VALUES(1,'Ram','Hyderabad','TL',6)
,(2,'Laxman','Hyderabad','TL',9)
,(3,'Suresh','Bangalore','Officer',6)
,(4,'Rajesh','Bangalore','Officer',9)
,(5,'Lokesh','Delhi','TL',6)
,(6,'Venkatesh','Mumbai','Manager',6)
,(7,'Subbu','Patna','Officer',9)
,(8,'Ravi','Hyderabad','Officer',9)
,(9,'Sai','Hyderabad','Manager',9)
,(10,'Satish','Hyderabad','Officer',6)
DECLARE #EmpRelation TABLE(EmpRelationShipID INT IDENTITY NOT NULL,ReportingTo INT,EmpID INT)
INSERT INTO #EmpRelation
VALUES(1,6)
,(2,9)
,(3,1)
,(4,5)
,(5,6)
,(7,2)
,(8,5)
,(10,1)
Here the ReportingManager Column in #Emp table indicates that If Emp
reports TL, then the TL's ManagerName.
Here ReportingTo Column in #EmpRelation indicates to whom he is
reporting.(TL or Manager).
Officers reports to TLs and TLs reports to Managers.
To get the result the have the below query which is working good
SELECT E.EmpId
,E.EmpName
,CASE
WHEN E.EmpId = E.ReportingManager
THEN 1
ELSE 0
END AS IsManager
,CASE
WHEN EXISTS (
SELECT NULL
FROM #EmpRelation ER
WHERE ER.ReportingTo = E.EmpId
)
THEN 1
ELSE 0
END AS HasSubordinates
,CASE WHEN E.EmpId != ReportingManager THEN 1 ELSE 0 END AS IsSubordinate
FROM #Emp E;
I want the query to be written using the joins instead of using the tables in Case statement.
I tried the below query. Please suggest any correction in terms of performance keeping view the future data size.
SELECT E.EmpId
,E.EmpName
,CASE
WHEN E.EmpId = E.ReportingManager
THEN 1
ELSE 0
END AS IsManager
,CASE WHEN HasSubordinate>0 THEN 1 ELSE 0 END HasSubordinates
,CASE WHEN E.EmpId != ReportingManager THEN 1 ELSE 0 END AS IsSubordinate
FROM #Emp E
LEFT JOIN (SELECT COUNT(*)HasSubordinate,ReportingTo Reporting FROM #EmpRelation ER GROUP BY ReportingTo)X ON X.Reporting=E.EmpID
Appreciate your help.
Thanks