Sql Server bulk update in stored procedure

CREATE PROCEDURE [dbo].[Update_Customers]

      @tblCustomers CustomerType READONLY

AS

BEGIN

      SET NOCOUNT ON;

      --UPDATE EXISTING RECORDS

      UPDATE Customers

      SET Name = c2.Name

      ,Country = c2.Country

      FROM Customers c1

      INNER JOIN @tblCustomers c2

      ON c1.CustomerId = c2.Id

 

      --INSERT NON-EXISTING RECORDS

      INSERT INTO Customers

      SELECT Id, Name, Country

      FROM @tblCustomers

      WHERE Id NOT IN(SELECT CustomerId FROM Customers)

END

from : https://www.aspsnippets.com/Articles/SqlBulkCopy--Bulk-Insert-records-and-Update-existing-rows-if-record-exists-using-C-and-VBNet.aspx