Which Conference Joined has a Previous Conference of northwestern, and a Mascot of oilers?
CREATE TABLE table_5610 (
    "School" text,
    "Location" text,
    "Mascot" text,
    "County" text,
    "Year Joined" real,
    "Previous Conference" text,
    "Year Left" real,
    "Conference Joined" text
)
SELECT "Conference Joined" FROM table_5610 WHERE "Previous Conference" = 'northwestern' AND "Mascot" = 'oilers'
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: Which Conference Joined has a Previous Conference of northwestern, and a Mascot of oilers? ### Input: CREATE TABLE table_5610 (
    "School" text,
    "Location" text,
    "Mascot" text,
    "County" text,
    "Year Joined" real,
    "Previous Conference" text,
    "Year Left" real,
    "Conference Joined" text
) ### Response: SELECT "Conference Joined" FROM table_5610 WHERE "Previous Conference" = 'northwestern' AND "Mascot" = 'oilers'