Without getting into the gory details, it is often needed to join tables from one DB to tables in another: a common, practical and sensible thing to do with RDBMS. Or even migrate data from one db to another. So, my question is how would one share data across database boundaries on the fly? Or, should one, could one, put the entire contents of one database into the schema of another? That even sounds bad but is that the way it would be done?
