Table: world_taekwondo_champs
Columns: rank
nation
gold
silver
bronze
total

Question: How many total silvers does Russia have?
SQL: SELECT COUNT("silver") FROM world_taekwondo_champs WHERE "nation" = 'russia'

Question: What is the average number of bronze medals of the Philippines, which has more than 0 gold?
SQL: SELECT AVG("bronze") FROM world_taekwondo_champs WHERE "nation" = 'philippines' AND "gold" > 0

Question: What is the average number of bronze of the nation with more than 1 gold and 1 silver medal?
SQL: SELECT AVG("bronze") FROM world_taekwondo_champs WHERE "gold" > 1 AND "silver" = 1

Question: What is the average total medals of the nation ranked 1 with less than 1 silver?
SQL: SELECT AVG("total") FROM world_taekwondo_champs WHERE "rank" = '1' AND "silver" < 1

Question: What is the lowest number of gold medals the nation with less than 0 silver medals has?
SQL: SELECT MIN("gold") FROM world_taekwondo_champs WHERE "silver" < 0