wordpress-seo-plugins

This can be done with plugins, there might be such plugins. But you can aldo do it with one simple sql query.

update your_wp_prefix_term_relationships set term_taxonomy_id= (select term_taxonomy_id from your_wp_prefix_term_taxonomy where term_id=_ID_NEW_) where term_taxonomy_id= (select term_taxonomy_id from your_wp_prefix_term_taxonomy where term_id=_ID_OLD_)

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