UPDATE cust_main SET country = "US" where country IS NULL OR country = '';
UPDATE cust_main_county SET country = "US" where country IS NULL OR country = "";
<!--CREATE TABLE part_title (
UPDATE cust_main SET country = "US" where country IS NULL OR country = '';
UPDATE cust_main_county SET country = "US" where country IS NULL OR country = "";
<!--CREATE TABLE part_title (