Table: malaysian_radio
Columns: frequency
station
operator
country_of_origin
transmitter_location
format

Question: Which station has a frequency of 873khz?
SQL: SELECT "station" FROM malaysian_radio WHERE "frequency" = '873khz'

Question: Where is the transmitter located for the station voice of vietnam
SQL: SELECT "transmitter_location" FROM malaysian_radio WHERE "station" = 'voice of vietnam'

Question: Which station is from China and has a frequency of 684khz?
SQL: SELECT "station" FROM malaysian_radio WHERE "country_of_origin" = 'china' AND "frequency" = '684khz'