Call Sign ใดที่มี Tail Code ed?ไม่จำเป็นต้องใช้ทุกตาราง
Which Call Sign that has Tail Code ed?It is not neccessary to use all the tables.
 table_name_80:  (call_sign [ VARCHAR ] tail_code [ VARCHAR) ]
SELECT call_sign FROM table_name_80 WHERE tail_code = "ed"