I need a SQL command to delete specific authors and all posts connected with them

This removes the posts and all associated post meta data:

DELETE a,b,c FROM `wp_posts` a
LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id)
LEFT JOIN wp_postmeta c ON (a.ID = c.post_id)
WHERE a.post_author="0";

Replace the 0 with the ID number for the post_author you wish to remove.

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