If they’re both simply straightforward database queries, then you don’t really need to do complicated joins… just do the specialized comparison in the code based on two simple (existing) queries, instead of having the database try figuring out exactly what you want out of it. Retrieve both sets of information (since they’re already both requested most of the time anyway), and present it to the browser for the client-side scripting (JavaScript) to put the marks on the table (if you’re worried about server performance)... or just do the comparison on the server and present it all at once.

I’d think the issue might be making it “too easy” to streak, not that it’d be a performance or implementation problem, but that’s just me. Log in to see images!