What is the average Gold, when Nation is Yugoslavia, and when Silver is greater than 0?
CREATE TABLE table_49687 (
    "Rank" text,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
)
SELECT AVG("Gold") FROM table_49687 WHERE "Nation" = 'yugoslavia' AND "Silver" > '0'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the average Gold, when Nation is Yugoslavia, and when Silver is greater than 0? ### Input: CREATE TABLE table_49687 (
    "Rank" text,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
) ### Response: SELECT AVG("Gold") FROM table_49687 WHERE "Nation" = 'yugoslavia' AND "Silver" > '0'