CREATE TABLE table_62944 ("Rank" FLOAT, "Nation" CLOB, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

What's the average number of silver medals when bronze is less than 0?
SELECT AVG("Silver") FROM table_62944 WHERE "Bronze" < '0'
SELECT AVG("Silver") FROM "table_62944" WHERE "Bronze" < '0'