-- Database schema
| breweries : id [ INTEGER ] primary_key , name [ TEXT ] , city [ TEXT ] , state [ TEXT ] | beers : id [ INTEGER ] primary_key , brewery_id [ INTEGER ] , abv [ REAL ] , ibu [ REAL ] , name [ TEXT ] , style [ TEXT ] , ounces [ REAL ] |
-- -- What is the average alcohol content per 12-ounce beer bottle produced by Boston Beer Company?

SELECT AVG(T1.abv) FROM beers AS T1 INNER JOIN breweries AS T2 ON T1.brewery_id = T2.id WHERE T2.name = 'Boston Beer Company' AND T1.ounces = 12;