If you try to delete a post via MySQL you will likely trash your entire WP database. I post likely has all kinds of referencial integrity checks in place... There are likely lots of tables that are using the post id and you'll need to delete from all of them first unless MySQL supports cascading deletes. But even then you risk screwing something up.
I'd highly recommend you use the Admin panel. I know it's not what you want to hear, but such is life.