Which Try diff has Tries for of 12?
CREATE TABLE table_14231 (
    "Team" text,
    "Tries for" real,
    "Tries against" real,
    "Try diff" text,
    "Points for" real,
    "Points against" real,
    "Points diff" text
)
SELECT "Try diff" FROM table_14231 WHERE "Tries for" = '12'
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 Try diff has Tries for of 12? ### Input: CREATE TABLE table_14231 (
    "Team" text,
    "Tries for" real,
    "Tries against" real,
    "Try diff" text,
    "Points for" real,
    "Points against" real,
    "Points diff" text
) ### Response: SELECT "Try diff" FROM table_14231 WHERE "Tries for" = '12'