CREATE TABLE table_name_78 (circuit VARCHAR2, length VARCHAR2, date VARCHAR2)

Which circuit has a length of 45 minutes and is held on August 6?
SELECT circuit FROM table_name_78 WHERE length = "45 minutes" AND date = "august 6"
SELECT "circuit" FROM "table_name_78" WHERE "45 minutes" = "length" AND "august 6" = "date"