UPDATE vn.supplier s
JOIN vn.country c ON c.id = s.countryFk
SET s.nif = MID(REPLACE(s.nif, ' ', ''), 3, LENGTH(REPLACE(s.nif, ' ', '')) - 1)
WHERE s.isVies = TRUE
AND c.code = LEFT(REPLACE(s.nif, ' ', ''), 2);