/*PASSE*/

DELETE first FROM term_relationship AS first
INNER JOIN post AS second ON first.object_id = second.id
INNER JOIN term_taxonomy AS third ON first.term_taxonomy_id = third.id
WHERE second.id = 1 AND third.taxonomy = 'category'

*/PASSE PAS*/

DELETE FROM term_relationship AS first
INNER JOIN post AS second ON first.object_id = second.id
INNER JOIN term_taxonomy AS third ON first.term_taxonomy_id = third.id
WHERE second.id = 1 AND third.taxonomy = 'category'