求每个终点的平均票价的SQL语句是A.SELECT终点,avg(票价)FROM ticket GROUP BY票价B.SELECT终点,
求每个终点的平均票价的SQL语句是
A.SELECT终点,avg(票价)FROM ticket GROUP BY票价
B.SELECT终点,avg(票价)FROM ticket ORDER BY票价
C.SELECT终点,avg(票价)FROM ticket ORDER BY终点
D.SELECT终点,avg(票价)FROM ticket GROUP BY终点