What was the surface where the outcome was winner on 12 march 1989?
CREATE TABLE table_name_19 (
    surface VARCHAR,
    outcome VARCHAR,
    date VARCHAR
)
SELECT surface FROM table_name_19 WHERE outcome = "winner" AND date = "12 march 1989"
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: What was the surface where the outcome was winner on 12 march 1989? ### Input: CREATE TABLE table_name_19 (
    surface VARCHAR,
    outcome VARCHAR,
    date VARCHAR
) ### Response: SELECT surface FROM table_name_19 WHERE outcome = "winner" AND date = "12 march 1989"