CREATE TABLE table_203_530 (id DECIMAL, "country" TEXT, "gdp  ( usd bln ,  2012 ) " DECIMAL, "gdp  ( usd bln ,  2017 ) " DECIMAL, "gdp  ( usd ppp bln ,  2012 ) " DECIMAL, "gdp  ( usd ppp bln ,  2017 ) " DECIMAL, "per capita  ( usd ,  2012 ) " DECIMAL, "per capita  ( usd ,  2017 ) " DECIMAL, "per capita  ( usd ppp ,  2012 ) " DECIMAL, "per capita  ( usd ppp ,  2017 ) " DECIMAL)

which country has the highest 2017 gdp ?
SELECT "country" FROM table_203_530 ORDER BY "gdp (usd bln, 2017)" DESC LIMIT 1
SELECT "country" FROM "table_203_530" ORDER BY "gdp (usd bln, 2017)" DESC NULLS LAST LIMIT 1