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DELETE a,b,c
FROM
	database.prefix_terms AS a
	LEFT JOIN database.prefix_term_taxonomy AS c ON a.term_id = c.term_id
	LEFT JOIN database.prefix_term_relationships AS b ON b.term_taxonomy_id = c.term_taxonomy_id
WHERE (
	c.taxonomy = 'post_tag' AND
	c.count = 0
	);