Solution 2, Sql Server

Solution 2

/*
Problem:
    Write a SQL statement to list all employees that do not have a manager.
    Add your solution at the end.

Expected Output:
    EmployeeId	FirstName	LastName
    1			Noah		Clooney
*/

-- Create a table called Employees
CREATE TABLE Employees (
    EmployeeId         INT     PRIMARY KEY,
    FirstName          VARCHAR(200),
    LastName           VARCHAR(200),
    ManagerEmployeeId  INT)
GO

-- Fill Employee table
INSERT INTO Employees VALUES(1, 'Noah', 'Clooney', NULL)
INSERT INTO Employees VALUES(2, 'Liam', 'Brolin', 1)
INSERT INTO Employees VALUES(3, 'Mason', 'Farrell', 1)
INSERT INTO Employees VALUES(4, 'Emma', 'Jolie', 1)
INSERT INTO Employees VALUES(5, 'Jacob', 'Foxx', 2)
INSERT INTO Employees VALUES(6, 'William', 'Damon', 4)
INSERT INTO Employees VALUES(7, 'Olivia', 'Johansson', 5)
INSERT INTO Employees VALUES(8, 'Isabella', 'Portman', 1)
INSERT INTO Employees VALUES(9, 'Ethan', 'Firth', 6)
INSERT INTO Employees VALUES(10, 'Emily', 'Theron', 7)
GO

------------------------------------------------------------------
-- Sql Server 2014 Express Edition - 12.0.2000.8
-- Solution.
------------------------------------------------------------------

SELECT EmployeeId, FirstName, LastName FROM Employees WHERE ManagerEmployeeId IS NULL


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