แคนตันเล่นได้กี่สถานี ?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
how many stations played in canton ?It is not neccessary to use all the tables.
 table_204_793:  id [ number]  "call-sign" [ text]  "location" [ text]  "rf" [ number]  "psip" [ number]  "programming" [ text] 
SELECT COUNT(*) FROM table_204_793 WHERE "location" = 'canton'