Table: canadian_oil_companies
Columns: april_2013_cum_rank
name
rank_all_2012
rank_all_2013
2013_rank_oil_companies
2013_rev_bil_usd
2013_profit_mil_usd
assets_bil_usd
market_cap_march_15_mil_usd

Question: How many companies had an april 2013 cumulative ranking of 3?
SQL: SELECT COUNT("market_cap_march_15_mil_usd") FROM canadian_oil_companies WHERE "april_2013_cum_rank" = 3

Question: What was the Forbers rank (all companies) in 2012 for cenovus energy?
SQL: SELECT "rank_all_2012" FROM canadian_oil_companies WHERE "name" = 'Cenovus Energy'

Question: How many assets in billions US$, for the company that ranked 1532 overall in 2013?
SQL: SELECT "assets_bil_usd" FROM canadian_oil_companies WHERE "rank_all_2013" = 1532

Question: How many companies named cenovus energy?
SQL: SELECT COUNT("rank_all_2013") FROM canadian_oil_companies WHERE "name" = 'Cenovus Energy'