Hi SASQ,
The libname engine is setup as one library per schema/datasource.
You can setup several libraries for each database and then create one concatenated library that contains all the libraries.
If there are duplicate tables you will access the one listed first in the library.
Also, if you write to your DBMS it will write in first schema.
So, this method can yield results that you don't intend.
It could look likes this ;
libname test1 [...];
libname test2 [...];
libname all (test1 test2);
Hope that helps
Cheers,