Error with post.php

Warning: Cannot modify header information – headers already sent by (output started at /public_html/wordpress/wp-includes/wp-db.php:98) in /public_html/wordpress/wp-admin/post.php on line 397

WordPress database error: [Can’t open file: ‘wp_posts.MYI’ (errno: 145)]
SELECT ID, post_name FROM wp_posts WHERE post_status = ‘static’ ORDER BY post_parent DESC

i was trying to edit one of my pages and it gave me this error. I’m confused as to why I can’t edit anything now.