which nations had a gold medal but no silver medals ?
CREATE TABLE table_204_311 (
    id number,
    "rank" number,
    "nation" text,
    "gold" number,
    "silver" number,
    "bronze" number,
    "total" number
)
SELECT "nation" FROM table_204_311 WHERE "gold" = 1 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: which nations had a gold medal but no silver medals ? ### Input: CREATE TABLE table_204_311 (
    id number,
    "rank" number,
    "nation" text,
    "gold" number,
    "silver" number,
    "bronze" number,
    "total" number
) ### Response: SELECT "nation" FROM table_204_311 WHERE "gold" = 1 AND "silver" = 0