CREATE TABLE table_73646 ("WEEK" FLOAT, "Sydney" FLOAT, "Melbourne" FLOAT, "Brisbane" FLOAT, "Adelaide" FLOAT, "Perth" FLOAT, "TOTAL" FLOAT, "WEEKLY RANK" FLOAT)

How many viewers were there in Sydney for the episode when there were 334000 in Melbourne?
SELECT "Sydney" FROM table_73646 WHERE "Melbourne" = '334000'
SELECT "Sydney" FROM "table_73646" WHERE "Melbourne" = '334000'