เครื่องส่งสัญญาณใดมีสะพาน bbca, alston หรือ haydon ที่สูงกว่า ไม่จำเป็นต้องใช้ตารางทั้งหมด
which transmitter has a higher bbca , alston or haydon bridge ?It is not neccessary to use all the tables.
 table_204_270:  id [ number]  "transmitter" [ text]  "kw" [ number]  "bbca" [ number]  "bbcb" [ number]  "d3&4" [ number]  "sdn" [ number]  "arqa" [ number]  "arqb" [ number]  "pol." [ text]  "a.g." [ text] 
SELECT "transmitter" FROM table_204_270 WHERE "transmitter" IN ('alston', 'haydon bridge') ORDER BY "bbca" DESC LIMIT 1