Thread:Project:Support desk/Count articles that belong only to two (or three) specific categories/reply (2)

Dear Emufarmer, sorry for the late reply.

Let's take the following example:

Category:Artist has > 1800 pages out of which e.g. 400 pages also belong to Category:1998 300 pages also belong to Category:2000

Category:1998 has in total 3000 pages, out of which only 400 pages are belonging also to Category:Artist Category:2000 has in total 1000 pages, out of which only 300 pages are belonging also to the Category:Artist

I need a possibility to show the following logical expression:

JOINT (ARTIST;1998) JOINT (ARTIST;2000)

which should result in 400 and 300 respectively.

Thanks for your help, Max