CREATE TABLE table_69669 ("Rank" FLOAT, "Nation" TEXT, "Gold" FLOAT, "Silver" FLOAT, "Bronze" FLOAT, "Total" FLOAT)

What is the average of the silver that has less than 0 gold
SELECT AVG("Silver") FROM table_69669 WHERE "Gold" < '0'
SELECT AVG("Silver") FROM "table_69669" WHERE "Gold" < '0'