What's the highest frequency of the KBDR callsign?
CREATE TABLE table_name_4 (frequency INTEGER, callsign VARCHAR)
SELECT MAX(frequency) FROM table_name_4 WHERE callsign = "kbdr"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_4 (frequency INTEGER, callsign VARCHAR) Question: What's the highest frequency of the KBDR callsign? [/INST] SELECT MAX(frequency) FROM table_name_4 WHERE callsign = "kbdr" </s>