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Wordpress: Get Unused Tags

/ Published in: MySQL
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If you run a query to delete old posts manually from MySQL in a WordPress database, the old tags will remain and appear in your tag cloud/listing. This allows you to identify those unused tags, and then delete them with an additional query.

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  1. SELECT * FROM wp_terms wt
  2. INNER JOIN wp_term_taxonomy wtt ON wt.term_id=wtt.term_id
  3. INNER JOIN wp_term_relationships wtr ON wtr.term_taxonomy_id=wtt.term_taxonomy_id
  4. LEFT JOIN wp_posts wp ON wp.ID=wtr.object_id
  5. WHERE
  6. taxonomy='post_tag'
  7. AND ID IS null
  8. AND NOT EXISTS(SELECT * From wp_terms wt2
  9.                 INNER JOIN wp_term_taxonomy wtt2 ON wt2.term_id=wtt2.term_id WHERE wtt2.parent=wt.term_id)
  10.  
  11. ORDER BY name

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