How in the world do people train their dogs to not peepeepoopoo inside a mall or a store?

Don't most dogs "go" inside a house before they're housetrained? How do you then train them to not "go" in a store or mall without them failing at least a few times?

Also, the mall around my place is HUGE and people stay in there for hours. Do dogowners take bathroom breaks for their dogs outside every two hours? What do you do with your dogs bathroom needs for all that time?