SQL Update From One Table To Another Based On A Id Match

I have an employees table and an EmployeeTerritories table. The employeeid in both these tables are in integer datatype. I have to create a new unique identifier column in both these tables and then update them accordingly.

1. I created a newsequentialid column in the employees table that will create new ids for the employees

2. Next, i added a new column to the employee territories table and set it as a foreign key to the employees table

3. now, i am in need of a query that will fetch the new guid from the employee table and fill in the employee territories table

4. i need to have a single update statement that do the trick by making use of the existing numerical id values

UPDATE EmployeeTerritories
SET
 empid = Id
FROM
 EmployeeTerritories
 INNER JOIN Employees
  ON Employees.EmployeeID = EmployeeTerritories.EmployeeID

This update statement will update the empid in the territories table based on the id matching. This saves a lot of time in comparison to the manual matching of ids and updating the data.

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