What is the least amount of silver medals won by Total with more than 1 bronze and more than 18 total medals won?
CREATE TABLE table_42928 (
    "Rank" text,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
)
SELECT MIN("Silver") FROM table_42928 WHERE "Bronze" > '1' AND "Nation" = 'total' AND "Total" > '18'
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 least amount of silver medals won by Total with more than 1 bronze and more than 18 total medals won? ### Input: CREATE TABLE table_42928 (
    "Rank" text,
    "Nation" text,
    "Gold" real,
    "Silver" real,
    "Bronze" real,
    "Total" real
) ### Response: SELECT MIN("Silver") FROM table_42928 WHERE "Bronze" > '1' AND "Nation" = 'total' AND "Total" > '18'