NOT IN as same with <> ALL

NOT IN
========
SELECT *
 FROM Emptable
 WHERE (Departmentid NOT IN (SELECT Departmentid
                              FROM Emptable AS Emptable_1
                              WHERE (Empid < 5)
                             )
        )
 GO

<> ALL
======
SELECT *
 FROM Emptable
 WHERE (Departmentid <> ALL (SELECT Departmentid
                              FROM Emptable AS Emptable_1
                              WHERE (Empid < 5)
                             )
        )
 GO

***both query will produce same output.