how many were carpet courts ?
CREATE TABLE table_204_638 (
    id number,
    "year" number,
    "tournament" text,
    "surface" text,
    "round" text,
    "winner" text,
    "score" text
)
SELECT COUNT(*) FROM table_204_638 WHERE "surface" = 'carpet'
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 were carpet courts ? ### Input: CREATE TABLE table_204_638 (
    id number,
    "year" number,
    "tournament" text,
    "surface" text,
    "round" text,
    "winner" text,
    "score" text
) ### Response: SELECT COUNT(*) FROM table_204_638 WHERE "surface" = 'carpet'