Table: world_weightlifting_2003
Columns: rank
nation
gold
silver
bronze
total

Question: What is the sum of the bronze medals of the nation with less than 0 silvers?
SQL: SELECT SUM("bronze") FROM world_weightlifting_2003 WHERE "silver" < 0

Question: What is the highest amount of bronze china, which has more than 1 gold and more than 11 total, has?
SQL: SELECT MAX("bronze") FROM world_weightlifting_2003 WHERE "gold" > 1 AND "nation" = 'china' AND "total" > 11

Question: Wha is the average number of bronze of hungary, which has less than 1 silver?
SQL: SELECT AVG("bronze") FROM world_weightlifting_2003 WHERE "nation" = 'hungary' AND "silver" < 1