CREATE TABLE table_39695 ("Week" FLOAT, "Date" CLOB, "Opponent" CLOB, "Result" CLOB, "Venue" CLOB, "Attendance" FLOAT)

What is the sum of the weeks that games occured on october 21, 1974 and less than 50,623 fans attended?
SELECT SUM("Week") FROM table_39695 WHERE "Date" = 'october 21, 1974' AND "Attendance" < '50,623'
SELECT SUM("Week") FROM "table_39695" WHERE "Attendance" < '50,623' AND "Date" = 'october 21, 1974'