Update from one Table to another based on ID match in SQL Server

I am new to Cursor.

How can i create a cursor for doing as below for all the tables.

I have to insert Name filed with ID in all below tables.

same id for same name, Country and email

just need to replicate with X as below.

UPDATE @CustomersTable SET [Country] = REPLICATE('X', LEN([Country])),Name =(select id from CustomersTable)

Customer table -> Now

IDNumber(pk)      ID        Country    Name    Active 

 1                      A001      SPAIN        JIM       Yes

 2                      A002      INDIA        RIM        No    

Person Table

Name   Country  IDNumber(pk) 

JIM       SPAIN     1

RIM       INDIA     2

It has to be as below:

Customer table -> 

IDNumber(pk)  ID        Country    Name    Active 

1                    A001     XXXXX      A001       Yes

2                    A002     XXXXX     A002      No   

Person Table ->

Name   Country    IDNumber(pk)

A001       XXXXX     1

A002       XXXXX     2