Versuchen Sie diese Abfrage -
UPDATE country_codes
SET country_code := @c := IF(@c IS NOT NULL AND country_code = 0, @c, country_code)
ORDER BY CAST(area_code AS CHAR)
Versuchen Sie diese Abfrage -
UPDATE country_codes
SET country_code := @c := IF(@c IS NOT NULL AND country_code = 0, @c, country_code)
ORDER BY CAST(area_code AS CHAR)