WordPress删除数据库所有文章和删除所有标签的sql语句

删除所有文章：

delete from wp_posts using wp_posts, wp_term_relationships, wp_term_taxonomy where wp_posts.id=wp_term_relationships.object_id and wp_term_relationships.term_taxonomy_id = wp_term_taxonomy.term_taxonomy_id and wp_term_relationships.term_taxonomy_id = 1 

删除所有标签：

DELETE a,b,c
FROM wp_terms AS a
LEFT JOIN wp_term_taxonomy AS c ON a.term_id = c.term_id
LEFT JOIN wp_term_relationships AS b ON b.term_taxonomy_id = c.term_taxonomy_id
WHERE c.taxonomy = 'post_tag' AND c.count = 0

注意事项：做任何修改，删减以及增加数据库的时候，一定要做好备份，毕竟数据无价。