CREATE TABLE table_1710 ("Episode #" FLOAT, "US air date" TEXT, "Rating" TEXT, "Share" TEXT, "Rating/Share  ( 18\\u201349 ) " TEXT, "Viewers  ( millions ) " TEXT)

What is the rating of the episode with a rating/share of 0.9/4?
SELECT "Rating" FROM table_1710 WHERE "Rating/Share (18\u201349)" = '0.9/4'
SELECT "Rating" FROM "table_1710" WHERE "Rating/Share (18\u201349)" = '0.9/4'