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)

what is the sum of the gdp -lrb- usd ppp bin , 2012 -rrb- between niger and sierra ?
SELECT SUM("gdp (usd ppp bln, 2012)") FROM table_203_530 WHERE "country" IN ('niger', 'sierra leone')
SELECT SUM("gdp (usd ppp bln, 2012)") FROM "table_203_530" WHERE "country" IN ('niger', 'sierra leone')