CREATE TABLE table_16581 ("#" FLOAT, "Episode" CLOB, "Rating" CLOB, "Share" FLOAT, "Rating/Share  ( 18-49 ) " CLOB, "Viewers  ( millions ) " CLOB, "Rank  ( timeslot ) " FLOAT, "Rank  ( night ) " FLOAT, "Rank  ( week ) " CLOB)

How many times was the rank (night) 11?
SELECT COUNT("Viewers (millions)") FROM table_16581 WHERE "Rank (night)" = '11'
SELECT COUNT("Viewers (millions)") FROM "table_16581" WHERE "Rank (night)" = '11'