Table: world_taekwondo_championships_2007
Columns: rank
nation
gold
silver
bronze
total

Question: What is the total number of Bronze, when Gold is greater than 0, when Rank is 4, and when Total is greater than 4?
SQL: SELECT COUNT("bronze") FROM world_taekwondo_championships_2007 WHERE "gold" > 0 AND "rank" = '4' AND "total" > 4

Question: What is the total number of Total, when Gold is less than 1, when Silver is greater than 0, when Rank is 14, and when Nation is Afghanistan?
SQL: SELECT COUNT("total") FROM world_taekwondo_championships_2007 WHERE "gold" < 1 AND "silver" > 0 AND "rank" = '14' AND "nation" = 'afghanistan'

Question: What is the lowest Gold, when Silver is 0, and when Bronze is 2?
SQL: SELECT MIN("gold") FROM world_taekwondo_championships_2007 WHERE "silver" = 0 AND "bronze" = 2

Question: What is the average Bronze, when Silver is 0, when Rank is 19, and when Total is greater than 2?
SQL: SELECT AVG("bronze") FROM world_taekwondo_championships_2007 WHERE "silver" = 0 AND "rank" = '19' AND "total" > 2