Name the surface for philadelphia
CREATE TABLE table_23235767_4 (
    surface VARCHAR,
    championship VARCHAR
)
SELECT surface FROM table_23235767_4 WHERE championship = "Philadelphia"
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: Name the surface for philadelphia ### Input: CREATE TABLE table_23235767_4 (
    surface VARCHAR,
    championship VARCHAR
) ### Response: SELECT surface FROM table_23235767_4 WHERE championship = "Philadelphia"