What is the frequency when callsign is dxru-fm?
CREATE TABLE table_23915973_1 (frequency VARCHAR, callsign VARCHAR)
SELECT frequency FROM table_23915973_1 WHERE callsign = "DXRU-FM"
### Context: CREATE TABLE table_23915973_1 (frequency VARCHAR, callsign VARCHAR) ### Question: What is the frequency when callsign is dxru-fm? ### Answer: SELECT frequency FROM table_23915973_1 WHERE callsign = "DXRU-FM"