How common are “bar fights”?

So in a few days I’m gonna start my new job as a bartender after working how many years in retail, and I’m just wondering how common this would actually be. Obviously the media doesn’t have an accurate representation of the real world, fights aren’t anywhere near as common as shows/movies/games. During my work in retail customers have gotten mad at each other (and me) plenty of times, but only once did it actually escalate into two people being physically violent with each other. People are bound to get angry with each other, but with alcohol making people a lot more impulsive/out-of-it, I’m wondering how often people will get physical with each other when they’re angry.