What I wish to obtain is a neat table displaying these columns from left to right -
"User Name", "Reputation", "Main site posts count", "Meta site posts count".
The problem here is that SEDE won't (or at least I think it won't, I may be wrong) be able to count posts from both the meta and main site. The SEDE site selector allows me to select, for example, "Mathematics" or "Mathematics Meta" but not both at once.
Of course, I can run SEDE once on the main site and another time on the meta site and then combine the two tables, but (1) I don't know how to combine the two tables, and (2) I hope there's a more efficient method here. Is there a way to combine Main and Meta sites in one query?