how much higher is the takapu road station than the wellington station ?
CREATE TABLE table_202_115 (
    id number,
    "station" text,
    "distance from wellington" text,
    "height above sea level (m)" text,
    "opened" text,
    "closed" text,
    "notes" text
)
SELECT (SELECT "height above sea level (m)" FROM table_202_115 WHERE "station" = 'takapu road') - (SELECT "height above sea level (m)" FROM table_202_115 WHERE "station" = 'wellington')
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 much higher is the takapu road station than the wellington station ? ### Input: CREATE TABLE table_202_115 (
    id number,
    "station" text,
    "distance from wellington" text,
    "height above sea level (m)" text,
    "opened" text,
    "closed" text,
    "notes" text
) ### Response: SELECT (SELECT "height above sea level (m)" FROM table_202_115 WHERE "station" = 'takapu road') - (SELECT "height above sea level (m)" FROM table_202_115 WHERE "station" = 'wellington')