WordPress应在下面提供此选项Attribute all posts to:

无论如何，我写了一篇关于这个的帖子(Clean Comments Table After User Deleted)

Edit

global $wpdb;
$admin_id = 1; // Assign admin user id here
$posts_table = $wpdb->prefix . \'posts\';
$users_table = $wpdb->prefix . \'users\';
$strQuery = "UPDATE `$posts_table` SET post_author = $admin_id WHERE post_author NOT IN (SELECT ID FROM $users_table)";
echo $strQuery;
$wpdb->query($strQuery);