"Paul" <paul.cocei@punct.ro> wrote:
> update cart set status = 1 where userid = (select userid from
> users where email = 'example@example.com');
>
> As you can see, the subquery is broken (users table doesn't have
> the column userid).
By standard, if the identifier isn't defined within the most local
scope, each enclosing scope, from the inside out, will be checked.
I would expect the above to update each row where cart.userid was
not null.
I always use and recommend aliases where practical. If you wrote it
this way, such a mistake would be clearly identified:
update cart set status = 1 where userid = (select u.userid from
users u where u.email = 'example@example.com');
Not a bug.
-Kevin