Table: paralympics_powerlifting_2008
Columns: rank
nation
gold
silver
bronze
total

Question: What is the nation when gold is 0, bronze is more than 0 and rank is 16?
SQL: SELECT "nation" FROM paralympics_powerlifting_2008 WHERE "gold" = 0 AND "bronze" > 0 AND "rank" = '16'

Question: what is the silver when the nation is syria (syr) and gold is more than 0?
SQL: SELECT SUM("silver") FROM paralympics_powerlifting_2008 WHERE "nation" = 'syria (syr)' AND "gold" > 0

Question: what is the average gold when rank is total and silver is more than 20?
SQL: SELECT AVG("gold") FROM paralympics_powerlifting_2008 WHERE "rank" = 'total' AND "silver" > 20

Question: what is the most silver when bronze is more than 0, total is more than 1, gold is more than 0 and the nation is china (chn)?
SQL: SELECT MAX("silver") FROM paralympics_powerlifting_2008 WHERE "bronze" > 0 AND "total" > 1 AND "gold" > 0 AND "nation" = 'china (chn)'