表結構如下：
flight
city{cityid, cityname)
實驗環境：
create table city(cityid int auto_increment primary
key,cityname varchar(20));
create table flight (flightid int auto_increment primary key,
startcityid int references city(cityid),
endcityid int references city(cityid),
starttime timestamp);
//航班本來應該沒有日期部分才好，但是下面的題目當中涉及到了日期
insert into city values(null,'北京'),(null,'上海'),(null,'廣州');
insert into flight values
(null,1,2,'9:37:23'),(null,1,3,'9:37:23'),(null,1,2,'10:37:23'),(null,2,3,'10:37:23');
1、查詢起飛城市是北京的所有航班，按到達城市的名字排序
參與運算的列是我起碼能夠顯示出來的那些列，但最終我不一定把它們顯示出來。各個表組合出來的中間結果欄位中必須包含所有運算的字段。
select * from flight f,city c
where f.endcityid = c.cityid and startcityid =
(select c1.cityid from city c1 where c1.cityname = "北京")
order by c.cityname asc;
mysql> select flight.flightid,'北京' startcity, e.cityname from
flight,city e wh
ere flight.endcityid=e.cityid and flight.startcityid=(select
cityid from city wh
ere cityname='北京');
mysql> select flight.flightid,s.cityname,e.cityname from
flight,city s,city e wh
ere flight.startcityid=s.cityid and s.cityname='北京' and
flight.endcityid=e.cit
yid order by e.cityname desc;
2、查詢北京到上海的所有航班紀錄（起飛城市，到達城市，起飛時間，航班號）
select c1.cityname,c2.cityname,f.starttime,f.flightid
from city c1,city c2,flight f
where f.startcityid=c1.cityid
and f.endcityid=c2.cityid
and c1.cityname='北京'
and c2.cityname='上海'
3、查詢具體某一天（2005-5-8）的北京到上海的的航班次數
select count(*) from
(select c1.cityname,c2.cityname,f.starttime,f.flightid
from city c1,city c2,flight f
where f.startcityid=c1.cityid
and f.endcityid=c2.cityid
and c1.cityname='北京'
and c2.cityname='上海'
and 查幫助獲得的某個日期處理函式(starttime) like '2005-5-8%'
mysql中提取日期部分進行比較的示例**如下：
select * from flight where
date_format(starttime,'%y-%m-%d')='1998-01-02'
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