What is the total frequency mhz of the kgrj call sign, which has an erp w greater than 21,500?
CREATE TABLE table_name_19 (frequency_mhz VARCHAR, call_sign VARCHAR, erp_w VARCHAR)
SELECT COUNT(frequency_mhz) FROM table_name_19 WHERE call_sign = "kgrj" AND erp_w > 21 OFFSET 500 ROWS
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_19 (frequency_mhz VARCHAR, call_sign VARCHAR, erp_w VARCHAR) Question: What is the total frequency mhz of the kgrj call sign, which has an erp w greater than 21,500? [/INST] SELECT COUNT(frequency_mhz) FROM table_name_19 WHERE call_sign = "kgrj" AND erp_w > 21 OFFSET 500 ROWS </s>