แสดงระยะทางตามชื่อในฮิสโตแกรมไม่จำเป็นต้องใช้ตารางทั้งหมด
Show me distance by name in a histogramIt is not neccessary to use all the tables.
 flight:  flno [ number(40)]  origin [ varchar2(20)]  destination [ varchar2(20)]  distance [ number(60)]  departure_date [ date]  arrival_date [ date]  price [ number(72)]  aid [ number(90)] 
SELECT name, distance FROM aircraft