CREATE TABLE table_26428 ("Profile" TEXT, "Bandwidth  (  MHz  ) " TEXT, "Number of carriers" FLOAT, "Carrier bandwidth  ( kHz ) " TEXT, "Power  (  dBm  ) " TEXT, "Max. downstream throughput  (  Mbit/s  ) " FLOAT)

What are the mhz when the profile is 8b?
SELECT "Bandwidth ( MHz )" FROM table_26428 WHERE "Profile" = '8b'
SELECT "Bandwidth ( MHz )" FROM "table_26428" WHERE "Profile" = '8b'