CREATE TABLE table_27892955_1 (written_by VARCHAR2, us_viewers__million_ VARCHAR2)

Who wrote episode that had 1.97 million u.s. viewers?
SELECT written_by FROM table_27892955_1 WHERE us_viewers__million_ = "1.97"
SELECT "written_by" FROM "table_27892955_1" WHERE "1.97" = "us_viewers__million_"