When trying to use the query multiple database function the following error occurs:
"schema.tablename is an undefined name"
The error occurs whether the schema is qualified or unqualified
Incorrect product usage. Trying to run a cross-query where one table exists in one database and the other table exists in the other database. The Multiple Database Query Wizard is designed with the assumption that all tables exist in each of the databases it's running against.
The product Toad Data Point is designed for running cross-database queries.