A "Are you sure you want to do this?" confirmation when you attempt to run a query that contains a destructive update (delete/update) without a where clause.   With the hoards of database tables being accidently wiped in the world, why hasn't this been done yet?  This feature would sure remove a lot of fear of pressing F5 *. * Those who are not afraid running a delete query query on a production database clearly haven't lived long enough yet.  On a similiar note, those who trust their code still need to experience taking down a couple of servers with it.