Yes you can eat raw green beans since raw green beans are edible and do not require cooking.
Eating the raw green beans will provide your body with more nutrition than eating the green beans cooked.
Cooking the green beans removes some of the nutrients from the green beans so your health will benefit more from eating the green beans raw.
But green beans when eaten raw may be hard to chew for some people and I find that cooking the green beans first makes them much more enjoyable to eat and easier to chew.
I used to eat raw green beans when I was a kid though and I probably did benefit my health then.
But my teeth are not as good now so I rarely do eat raw green beans but you certainly can eat the green beans raw if you want too.
Canned green beans are already cooked which makes them ready to eat so you can eat the canned green beans directly from the can if you want too.
But I prefer to heat the canned green beans up first because I don't like to eat cold food unless I have too.