DYMY ความถี่ใด?ไม่จำเป็นต้องใช้ตารางทั้งหมด
Which frequency is DYMY?It is not neccessary to use all the tables.
 table_23910822_1:  (frequency [ VARCHAR ] callsign [ VARCHAR) ]
SELECT frequency FROM table_23910822_1 WHERE callsign = "DYMY"