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"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_23915973_1 (frequency VARCHAR, callsign VARCHAR) Question: What is the frequency when callsign is dxru-fm? [/INST] SELECT frequency FROM table_23915973_1 WHERE callsign = "DXRU-FM" </s>