CREATE TABLE table_33786 ("Rank" FLOAT, "City" TEXT, "State" TEXT, "GDP in $ID B" TEXT, "Population M  ( LUZ ) " FLOAT, "GDP per capita $ID K" TEXT, "Eurozone" TEXT)

What is the GDP $IDB in Istanbul?
SELECT "GDP in $ID B" FROM table_33786 WHERE "City" = 'istanbul'
SELECT "GDP in $ID B" FROM "table_33786" WHERE "City" = 'istanbul'