Table: african_judo_2008
Columns: rank
nation
gold
silver
bronze
total

Question: What is the smallest number of silver medals for a nation with fewer than 1 bronze?
SQL: SELECT MIN("silver") FROM african_judo_2008 WHERE "bronze" < 1

Question: How many gold medals for the nation ranked 6?
SQL: SELECT "gold" FROM african_judo_2008 WHERE "rank" = '6'