Table: seafood_ships
Columns: name
length
tonnage
built_by
year
engines
horsepowers
former_names

Question: Which Built by has a Name of northern jaeger?
SQL: SELECT "built_by" FROM seafood_ships WHERE "name" = 'northern jaeger'

Question: How many Horsepowers have a Year smaller than 1974, and a Tonnage of 4437?
SQL: SELECT SUM("horsepowers") FROM seafood_ships WHERE "year" < 1974 AND "tonnage" = 4437