sql server function example to find managed employees

Prepare data:

USE AdventureWorks2008
GO

CREATE TABLE HumanResources.Employee2
(
  EmployeeID int NOT NULL,
  ManagerID int NULL REFERENCES HumanResources.Employee2(EmployeeID),
  JobTitle nvarchar(50) NOT NULL,
  LastName nvarchar(50) NOT NULL,
  FirstName nvarchar(50) NOT NULL,
    CONSTRAINT PK_Employee2_EmployeeID PRIMARY KEY CLUSTERED (EmployeeID ASC)
);

INSERT INTO HumanResources.Employee2(EmployeeID,ManagerID,JobTitle,LastName,FirstName)
VALUES
  (1, NULL, 'CEO','Smith', 'Hunter'),
  (2, 1, 'CFO', 'Jones', 'Drew'),
  (3, 1, 'COO','Lenzy','Sheila'),
  (4, 1, 'CTO', 'Huntington', 'Karla'),
  (5, 4, 'VP of Engineering', 'Gutierrez', 'Ron'),
  (8, 5, 'VP of Engineering', 'Gutierrez', 'Ron'),
  (9, 5, 'Software Engineer', 'Bray', 'Marky'),
  (10 ,5, 'Data Architect', 'Cheechov', 'Robert'),
  (11 ,5, 'Software Engineer', 'Gale', 'Sue'),
  (6, 4, 'VP of Professional Services', 'Cross', 'Gary'),
  (7, 4, 'VP of Security','Lebowski','Jeff');

 

Define the function

USE AdventureWorks2008
GO

create function dbo.getManagedEmployee(@managerId int)
returns @employees table(
employeeId int,
managerId int
)
as
begin
insert @employees
select EmployeeID, ManagerID from HumanResources.Employee2 where managerid=@managerId

declare @current int
select @current=min(employeeid) from @employees where managerid=@managerid

while @current is not null
begin
insert @employees select * from getManagedEmployee(@current)
select @current=min(employeeid) from @employees where managerid=@managerid and employeeid>@current
end 
return
end

 

Call the function:

USE AdventureWorks2008
select * from getManagedEmployee(4)