CREATE TABLE table_name_7 (rank INT, industry VARCHAR, revenue_in_usd VARCHAR)

What is the rank of the petroleum company who has a revenue of $481.7 billion?
SELECT MIN(rank) FROM table_name_7 WHERE industry = "petroleum" AND revenue_in_usd = "$481.7 billion"
SELECT MIN("rank") FROM "table_name_7" WHERE "$481.7 billion" = "revenue_in_usd" AND "industry" = "petroleum"