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

[单选题]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

[单选题]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

[单选题]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

[单选题]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

[单选题]求每个单位的平均基本工资的SQL语句是( )。A．SELECT 单位,avg(基本工资) FROM zg GROUP BY基本工资B．SELECT 单位,avg(基本工资) FROM zg ORDER BY基本工资C．SELECT 单位,avg(基本工资) FROM zg ORDER BY单位D．SELECT 单位,avg(基本工资) FROM zg GROUP BY单位

[单选题]求每个交易所的平均单价的SQL语句是A．SELECT交易所，avg(单价)FROM stock GROUP BY单价B．SELECT 交易所，avg(单价) FROM stock ORDER BY单价C．SELECT 交易所，avg(单价) FROM stock ORDER BY交易所D．SELECT 交易所，avg(单价) FROM stock GROUP BY交易所

[单选题]求每个交易所的平均单价的SQL语句是______。A．SELECT 交易所,avg(单价)FROM stock GROUP BY 单价B．SELECT 交易所,avg(单价)FROM stock ORDER BY 单价C．SELECT 交易所,avg(单价)FROM stock ORDER BY 交易所D．SELECT 交易所,avg(单价)FROM stock GROUP BY 交易所

[单选题]求每个交易所的平均单价的SQL语句是A．)SELECT交易所，avg(单价）FROM stock GRDER BY单价B．)SELECT交易所，avg(单价）FROM stock ORDER BY单价C．)SELECT交易所，avg(单价）FROM stock ORDER BY交易所D．)SELECT交易所，avg(单价）FROM stock GROUP BY交易所

[单选题]求每个交易所的平均单价的SL语句是

[主观题]写出求某字段最大值的SQL语句.