CREATE TABLE table_2261 ("Episode Number" FLOAT, "Episode" CLOB, "Rating" CLOB, "Share" FLOAT, "Rating/Share  ( 18-49 ) " CLOB, "Viewers  ( millions ) " CLOB, "Rank  ( Timeslot ) " CLOB, "Rank  ( Overall ) " CLOB)

What is overall rank when viewers are at 6.59 million?
SELECT "Rank (Overall)" FROM table_2261 WHERE "Viewers (millions)" = '6.59'
SELECT "Rank (Overall)" FROM "table_2261" WHERE "Viewers (millions)" = '6.59'