They don't put sugar in beer.
beer has no fat in it
"Beer sugar" is often referred to as maltose. A sugar derived of malted barley.
sugar cane
beer
Root beer is made by frementing a blend of roots, barks, herbs, sugar, and yeast.
It depends on if the root beer is sugar-free or not, (and how large your glass is)....
it depends on what kind of beer it is
Some beers may contain sugar. Most of any sugar used when processing beer is converted to alcohol by the yeast. However, some residual sugars may remain. How much sugar depends on the actual brand of beer.
Nobody seems to know
On the count of the fact sugars are used by yeast as food and are converted to alcohol. There is probably little to no sugar in most light bodied beers like Bud Light. But still be wary of the empty calories that are plentiful in all beers :)
Beer typically contains more sugar than salt. The sugar in beer comes from the fermentation of grains like barley or wheat, whereas salt is not a common ingredient in the brewing process. However, the sugar content in beer can vary depending on the style and ingredients used.