CREATE TABLE table_name_91 (frequency_mhz NUMBER, city_of_license VARCHAR2)

What is the number of Frequency MHz in woodstock, georgia?
SELECT SUM(frequency_mhz) FROM table_name_91 WHERE city_of_license = "woodstock, georgia"
SELECT SUM("frequency_mhz") FROM "table_name_91" WHERE "city_of_license" = "woodstock, georgia"