You don't glue it, you sweat them. That is the term used for soldering them together.
Yes, as long as there is a mechanical connection , ie threaded. You cannot glue them to each other.
a tuba glue
Yes and NO depending on what kind of piping system. for drain connections yes like tub drains or fixture traps but you need access to all slip/compression fittings. and NO you can not use PVC to brass for like a discharge pipe on a waterheater PRV (pressure relief valve) or any hot water piping system
Epoxy is the only thing for that.
p,b,a glue.
If the copper is quite thin, super glue will work.
You can glue things faster and more easily with a glue gun than with a tube of glue (although I still use tubes, personally).
a tuba glue
No glue is used for copper. Copper wires and pipes are soldered together. This involves heating both pieces and melting a lead/tin wire into them.
What is used to repair big brass band instruments? The answer to this riddle: A tuba glue!
No I would never use copper or brass in any home for a waste and overflow on a tub. I would use all glue together waste and over flows because they last and are strong .
Epoxy if not much to glue. PL200 in caulk tubes if there is lots to glue.