CREATE TABLE table_12171145_1 (mens_doubles VARCHAR, womens_singles VARCHAR)

Who was the mens doubles when womens singles is mette s rensen?
SELECT mens_doubles FROM table_12171145_1 WHERE womens_singles = "Mette Sørensen"
SELECT "mens_doubles" FROM "table_12171145_1" WHERE "Mette Sørensen" = "womens_singles"