CREATE TABLE table_name_34 (date VARCHAR, circuit VARCHAR, winning_manufacturer VARCHAR)

What was the date of Circuit Hockenheimring and the winning manufacturer being Mercedes-Benz?
SELECT date FROM table_name_34 WHERE circuit = "hockenheimring" AND winning_manufacturer = "mercedes-benz"
SELECT "date" FROM "table_name_34" WHERE "circuit" = "hockenheimring" AND "mercedes-benz" = "winning_manufacturer"