Table: cac_40_companies
Columns: company
icb_sector
ticker_symbol
index_weighting_at_17_january_2013
market_cap_at_april_2013

Question: Which ICB Sector had a ticker symbol of pp?
SQL: SELECT "icb_sector" FROM cac_40_companies WHERE "ticker_symbol" = 'pp'

Question: Which ICB Sector belongs to vallourec?
SQL: SELECT "icb_sector" FROM cac_40_companies WHERE "company" = 'vallourec'