which nation had as many silver medals as mexico and turkey combined ?
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 "silver" = (SELECT SUM("silver") FROM table_204_311 WHERE "nation" IN ('mexico', 'turkey'))
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 nation had as many silver medals as mexico and turkey combined ? ### 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 "silver" = (SELECT SUM("silver") FROM table_204_311 WHERE "nation" IN ('mexico', 'turkey'))