Table: radio_calls
Columns: callsign
area_served
frequency
band
fate
freq_currently
purpose

Question: Which area served has a Callsign of 5ddn?
SQL: SELECT "area_served" FROM radio_calls WHERE "callsign" = '5ddn'

Question: What is the purpose for Frequency of 102.3?
SQL: SELECT "purpose" FROM radio_calls WHERE "frequency" = '102.3'

Question: What is the current freq for Frequency of 104.7?
SQL: SELECT "freq_currently" FROM radio_calls WHERE "frequency" = '104.7'