-- Add country_code to existing prc_zone (skip if re-running full zone_country.sql)
-- charset: utf8mb4

ALTER TABLE prc_zone
  ADD COLUMN country_code VARCHAR(10) NULL COMMENT 'ISO2 country code from bms_region' AFTER region_id;

UPDATE prc_zone z
INNER JOIN bms_region r ON r.region_id = z.region_id
SET z.country_code = r.country_code_2
WHERE z.country_code IS NULL OR z.country_code = '';

ALTER TABLE prc_zone
  MODIFY COLUMN country_code VARCHAR(10) NOT NULL COMMENT 'ISO2 country code from bms_region';

ALTER TABLE prc_zone
  ADD INDEX idx_zone_country_code (country_code);