No common parent: Solution with Pullup possible?

Hi all,

I have the following issue:

I have 2 tables
Table1: articlenumber, …
Table2: articlenumber, …

I have no key defined in data model due to other reasons.

Is it possible to define the key in the analysis, e.g. by using the pullup function so use both tables together (e.g. to find out how many articles are in table1 but not in table 2?

Many thanks and br
Daniel