CREATE TABLE table_71850 ("7:00" TEXT, "7:30" TEXT, "8:00" TEXT, "8:30" TEXT, "9:00" TEXT, "9:30" TEXT, "10:00" TEXT)

On the channel with The Biggest loser at 8:00, what's on at 7:30?
SELECT "7:30" FROM table_71850 WHERE "8:00" = 'the biggest loser'
SELECT "7:30" FROM "table_71850" WHERE "8:00" = 'the biggest loser'