Insert all post IDs in new database table

Like so:

INSERT INTO $mytable (post_id)
SELECT ID
FROM $wpdb->posts as posts
LEFT JOIN $mytable as dup_check
ON dup_check.post_id = posts.ID
WHERE dup_check.post_id IS NULL;

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)