CREATE TABLE table_17988 ("No." FLOAT, "Air Date" CLOB, "Rating" CLOB, "Share" FLOAT, "18-49  ( Rating/Share ) " CLOB, "Viewers  ( m ) " CLOB, "Night" FLOAT, "Timeslot" FLOAT, "Overall" CLOB)

what are all the overall with viewers (m) being 2.61
SELECT "Overall" FROM table_17988 WHERE "Viewers (m)" = '2.61'
SELECT "Overall" FROM "table_17988" WHERE "Viewers (m)" = '2.61'