How many clubs had 7 wins?
CREATE TABLE table_18957 (
    "Club" text,
    "Played" text,
    "Won" text,
    "Drawn" text,
    "Lost" text,
    "Points for" text,
    "Points against" text,
    "Tries for" text,
    "Points" text
)
SELECT COUNT("Club") FROM table_18957 WHERE "Won" = '7'
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: How many clubs had 7 wins? ### Input: CREATE TABLE table_18957 (
    "Club" text,
    "Played" text,
    "Won" text,
    "Drawn" text,
    "Lost" text,
    "Points for" text,
    "Points against" text,
    "Tries for" text,
    "Points" text
) ### Response: SELECT COUNT("Club") FROM table_18957 WHERE "Won" = '7'