What is the sum of the weeks that games occured on october 21, 1974 and less than 50,623 fans attended?
CREATE TABLE table_name_20 (
    week INTEGER,
    date VARCHAR,
    attendance VARCHAR
)
SELECT SUM(week) FROM table_name_20 WHERE date = "october 21, 1974" AND attendance < 50 OFFSET 623
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 sum of the weeks that games occured on october 21, 1974 and less than 50,623 fans attended? ### Input: CREATE TABLE table_name_20 (
    week INTEGER,
    date VARCHAR,
    attendance VARCHAR
) ### Response: SELECT SUM(week) FROM table_name_20 WHERE date = "october 21, 1974" AND attendance < 50 OFFSET 623