CREATE TABLE table_27191 ("#" FLOAT, "Episode" CLOB, "Air Date" CLOB, "Timeslot  ( EST ) " CLOB, "Rating" CLOB, "Share" FLOAT, "18-49  ( Rating/Share ) " CLOB, "Viewers  ( m ) " CLOB, "Weekly Rank  ( # ) " FLOAT)

How many episodes aired on October 17, 2007?
SELECT COUNT("Episode") FROM table_27191 WHERE "Air Date" = 'October 17, 2007'
SELECT COUNT("Episode") FROM "table_27191" WHERE "Air Date" = 'October 17, 2007'