Sql query to find total number of employees working under my manager

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Need to Pass employee Id and get total number of employees working under the manager whose employee id is passed in SQL.

Out should be like this : -

EmplD NoofEmployees

1234 10
2562 25

Where 10 & 25 is actually the total number of employees working under the manager of EmplD 1234 and 2562 resp.

What I have tried:

I tried CTE and Self Join but i need a solution with better performance.

Posted 3-May-17 0:21am

Deepak.xip

Updated 3-May-17 0:32am

v2

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OriginalGriff · Answer 1 · 2017-05-03T00:32:00

So, you want us to give you a query to work with data that we can't see, and have no idea how it is organised?

That might not be easy, but...
Assuming your data is similar to this:

Employees: ID   Name   ManagerID

Then a simple GROUP BY will do it:

SQL

SELECT ManagerID, COUNT(ID) FROM Employees GROUP BY ManagerID

If it isn't, we'd need a load more info before we could begin to answer.

"The Table is something like this :"

Use a JOIN with the GROUP by:

SQL

SELECT e.ID, e.Name, m.MngCount FROM EMPLOYEE e
JOIN (SELECT ManagerID, COUNT(ID) as MngCount FROM Employees GROUP BY ManagerID) m 
ON e.ManagerID = m.ManagerID