Nowadays you can't go past an item of food or drink that won't have nutritional information somewhere on its packaging. I think the only exception to this is alcoholic beverages.
My first question is why? My second question is on average how many grams of sugar (refined, processed, raw or otherwise) would you find in 12oz can of beer?
Many beers list ingredients. They usually consist of water, barley, hops, yeast. Some will have other things to put on the label, usually corn or rice.
At least in the States, the regulatory authorities are loath to treat any alcoholic beverages as a food product. Which means they aren't going to require the same things of alcohol that they require of food.
For most, zero or pretty close to it, if by "sugar" you mean the simple sugars that usually get identified by that term on nutrition labels (sugars like sucrose, fructose, etc.). Simple sugars get digested by yeast and turned to alcohol. There are complex sugars that yeast can't digest, and that your body has to break down to digest, in much the same way it has to break down more complex carbohydrates. In that case, the residual carbs in beer are going to vary widely based on the style of beer, attenuation, and a whole lot of other factors.
-Steve
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