Write a postgre SQL statement to add a column region_id to the table locations

 Write a  postgre SQL statement to add a column region_id to the table locations.

Here is the structure of the table locations.

postgres=# \d locations
     Column     |         Type          | Modifiers
----------------+-----------------------+-----------
 location_id    | numeric(4,0)          |
 street_address | character varying(40) |
 postal_code    | character varying(12) |
 city           | character varying(30) |
 state_province | character varying(25) |
 country_id     | character varying(2)  |