What is the average Joined with a Nickname of wildcats in longmeadow, massachusetts?
CREATE TABLE table_15612 (
    "Location" text,
    "Nickname" text,
    "Founded" real,
    "Type" text,
    "Enrollment" real,
    "Joined" real,
    "Left" real,
    "Current Conference" text
)
SELECT AVG("Joined") FROM table_15612 WHERE "Nickname" = 'wildcats' AND "Location" = 'longmeadow, massachusetts'
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 is the average Joined with a Nickname of wildcats in longmeadow, massachusetts? ### Input: CREATE TABLE table_15612 (
    "Location" text,
    "Nickname" text,
    "Founded" real,
    "Type" text,
    "Enrollment" real,
    "Joined" real,
    "Left" real,
    "Current Conference" text
) ### Response: SELECT AVG("Joined") FROM table_15612 WHERE "Nickname" = 'wildcats' AND "Location" = 'longmeadow, massachusetts'