CREATE TABLE table_name_15 (modern_equivalent VARCHAR2, pre_1009_province VARCHAR2, province_of_silla VARCHAR2)

What kind of Modern equivalent that has a Pre-1009 province of sakbang -do, and a Province of Silla of sakju?
SELECT modern_equivalent FROM table_name_15 WHERE pre_1009_province = "sakbang -do" AND province_of_silla = "sakju"
SELECT "modern_equivalent" FROM "table_name_15" WHERE "pre_1009_province" = "sakbang -do" AND "province_of_silla" = "sakju"