CREATE TABLE table_name_20 (performer_s_ VARCHAR, composer_s_ VARCHAR)

Who sang the song composed by Mariah Carey and Walter Afanasieff?
SELECT performer_s_ FROM table_name_20 WHERE composer_s_ = "mariah carey and walter afanasieff"
SELECT "performer_s_" FROM "table_name_20" WHERE "composer_s_" = "mariah carey and walter afanasieff"