Question: How many silver medals did Spain have when they had more than 0 bronze medals and less than 54 total medals?
SQL: SELECT "Silver" FROM "2-18618431-4" WHERE "Bronze" > 0.0 AND "Total" < 54.0 AND "Nation" = 'Spain';

Question: What was the highest number of gold medals when there were 0 silver medals?
SQL: SELECT MAX("Gold") FROM "2-18618431-4" WHERE "Silver" < 0.0;