Table: wrestling_1979
Columns: rank
nation
gold
silver
bronze
total

Question: What is the sum of the golds of the nation with 5 total and less than 0 bronze medals?
SQL: SELECT SUM("gold") FROM wrestling_1979 WHERE "total" = 5 AND "bronze" < 0

Question: What is the sum of the gold medals of the total nation, which has more than 19 silver medals?
SQL: SELECT SUM("gold") FROM wrestling_1979 WHERE "nation" = 'total' AND "silver" > 19

Question: What is the average number of silver medals of the nation with 3 bronzes and more than 4 total medals?
SQL: SELECT AVG("silver") FROM wrestling_1979 WHERE "bronze" = 3 AND "total" > 4