CREATE TABLE table_203_320 (id DECIMAL, "rank in\ 2011" DECIMAL, "name of\ concern" TEXT, "location of\ headquarters" TEXT, "revenue\ ( thou.\ pln ) " DECIMAL, "profit\ ( thou.\ pln ) " DECIMAL, "employees" DECIMAL)

which company had the most revenue ?
SELECT "name of\nconcern" FROM table_203_320 ORDER BY "revenue\n(thou.\npln)" DESC LIMIT 1
SELECT "name of\nconcern" FROM "table_203_320" ORDER BY "revenue\n(thou.\npln)" DESC NULLS LAST LIMIT 1