CREATE TABLE table_17482534_1 (us_viewers__millions_ VARCHAR2, written_by VARCHAR2)

How many viewers did the episode written by Warren Lieberstein & Halsted Sullivan have?
SELECT us_viewers__millions_ FROM table_17482534_1 WHERE written_by = "Warren Lieberstein & Halsted Sullivan"
SELECT "us_viewers__millions_" FROM "table_17482534_1" WHERE "Warren Lieberstein & Halsted Sullivan" = "written_by"