Is there an equivalent to OPENROWSET in Oracle? Is there an equivalent to OPENROWSET in Oracle?

From OPENROWSET (Transact-SQL):
This method is an alternative to accessing tables in a linked server and is a one-time, ad hoc method of connecting and accessing remote data by using OLE DB.
Answer provided by John Eisbrener in a comment

The effective equivalent is a Database Link.  Sadly there's not an identical equivalent to what OPENROWSET does in one Oracle command or statement.  You have to declare the db link first before accessing it.  If you don't want to edit a tnsnames.ora file, you can create the dblink using an in-line statement, which allows you to programmatically emulate OPENROWSET functionality.