CREATE TABLE table_12171145_1 (womens_doubles VARCHAR2, mixed_doubles VARCHAR2)

Who was the womens doubles when the mixed doubles is jacco arends selena piek?
SELECT womens_doubles FROM table_12171145_1 WHERE mixed_doubles = "Jacco Arends Selena Piek"
SELECT "womens_doubles" FROM "table_12171145_1" WHERE "Jacco Arends Selena Piek" = "mixed_doubles"