Table: radio_stations_qld
Columns: callsign
area_served
band
freq_currently
purpose

Question: What is the Callsign in Brisbane with a Freq currently of 4rph?
SQL: SELECT "callsign" FROM radio_stations_qld WHERE "area_served" = 'brisbane' AND "freq_currently" = '4rph'

Question: What is the Freq currently of the 4GG Callsign?
SQL: SELECT "freq_currently" FROM radio_stations_qld WHERE "callsign" = '4gg'

Question: What is the Community Band with a 4BCB Callsign?
SQL: SELECT "band" FROM radio_stations_qld WHERE "purpose" = 'community' AND "callsign" = '4bcb'

Question: What is the Purpose of the Callsign with a Freq currently of 4gld?
SQL: SELECT "purpose" FROM radio_stations_qld WHERE "freq_currently" = '4gld'

Question: What is the Purpose of the Callsign with a Freq currently of 4rph?
SQL: SELECT "purpose" FROM radio_stations_qld WHERE "freq_currently" = '4rph'