Table: indigenous_radio_stations
Columns: call_sign
launched
transmitting_from
coverage
languages
frequency

Question: What frequency does Chihuahua Sinaloa Durango cover?
SQL: SELECT "frequency" FROM indigenous_radio_stations WHERE "coverage" = 'Chihuahua Sinaloa Durango'

Question: How many times does the call sign XEZV appear?
SQL: SELECT COUNT("transmitting_from") FROM indigenous_radio_stations WHERE "call_sign" = 'XEZV'

Question: What languages are spoken when call sign XEJAM is used?
SQL: SELECT "languages" FROM indigenous_radio_stations WHERE "call_sign" = 'XEJAM'