Table: radio_stations_56
Columns: call_sign
frequency_mhz
city_of_license
erp_w
class
fcc_info

Question: Which Class has a Frequency MHz larger than 91.5, and a City of license of hyannis, nebraska?
SQL: SELECT "class" FROM radio_stations_56 WHERE "frequency_mhz" > 91.5 AND "city_of_license" = 'hyannis, nebraska'

Question: Which Class has a ERP W larger than 205, and a Frequency MHz smaller than 93.9, and a Call sign of k210cb?
SQL: SELECT "class" FROM radio_stations_56 WHERE "erp_w" > 205 AND "frequency_mhz" < 93.9 AND "call_sign" = 'k210cb'

Question: Which Frequency MHz that has a ERP W larger than 205, and a Call sign of k230ap?
SQL: SELECT MAX("frequency_mhz") FROM radio_stations_56 WHERE "erp_w" > 205 AND "call_sign" = 'k230ap'

Question: Which Frequency MHz has a ERP W of 250?
SQL: SELECT MAX("frequency_mhz") FROM radio_stations_56 WHERE "erp_w" = 250