我最近一直在为uni做很多MySql,我似乎无法弄清楚如何在同一个语句中两次从表中获取一个字段。 我的数据库是这样的:如何从同一个mysql表中选择两次列?
drop database if exists AIRLINE;
create database AIRLINE;
use AIRLINE;
CREATE TABLE AIRCRAFT
(
AircraftNo INT(20) NOT NULL,
AircraftType VARCHAR(100) NOT NULL,
FuelBurn VARCHAR(100) NOT NULL,
Airspeed VARCHAR(100) NULL,
LastInspection DATE NULL,
TotalFlyingTime INT(50) NOT NULL,
TotalTimeLeftEngine INT(50) NULL,
TotalTimeRightEngine INT(50) NULL,
PRIMARY KEY (AircraftNo)
);
CREATE TABLE PILOT
(
PilotCode INT(20) NOT NULL,
LastName VARCHAR(100) NOT NULL,
FirstName VARCHAR(100) NOT NULL,
MiddleInitial VARCHAR(50) NULL,
HiredDate DATE NULL,
BasePay VARCHAR(50) NULL,
Dependents VARCHAR(100) NULL,
License INT(50) NOT NULL,
TotalHours INT(50) NOT NULL,
PRIMARY KEY (PilotCode)
);
CREATE TABLE CUSTOMER
(
CustomerNo INT(20) NOT NULL,
Name VARCHAR(100) NOT NULL,
Contact INT(50) NOT NULL,
Phone INT(50) NOT NULL,
Street VARCHAR(100) NULL,
Suburb VARCHAR(100) NULL,
State VARCHAR(100) NULL,
Postcode INT(20) NULL,
Balance INT(50) NULL,
PRIMARY KEY (CustomerNo)
);
CREATE TABLE CHARTER
(
TripTicket INT(50) NOT NULL AUTO_INCREMENT,
CharterDate DATE NOT NULL,
PilotCode INT(20) NOT NULL,
CopilotCode INT(20) NULL,
AircraftNo INT(20) NOT NULL,
Destination VARCHAR(100) NOT NULL,
Distance INT(20) NULL,
HoursFlow INT(20) NULL,
HoursWating INT(20) NULL,
Fuel INT(20) NULL,
Oil INT(20) NULL,
CustomerNo INT(20) NOT NULL,
PRIMARY KEY (TripTicket),
FOREIGN KEY(PilotCode) REFERENCES PILOT(PilotCode),
FOREIGN KEY(CopilotCode) REFERENCES PILOT(PilotCode),
FOREIGN KEY(AircraftNo) REFERENCES AIRCRAFT(AircraftNo),
FOREIGN KEY(CustomerNo) REFERENCES CUSTOMER(CustomerNo)
);
我的目标是列出charterdate,目标,客户的详细信息(姓名,customerNo,地址,电话),以及所有章程的飞行员名字(名字,middleinitial,姓氏)。 我已经设法得到一切,但只有一名飞行员。我需要列出两个试点名称。
我GOOGLE了我的问题,但我似乎无法找到任何东西。
如果有人可以请指点我正确的方向,我将非常感激。
感谢 干杯 科瑞
你能分享你所查询尝试到目前为止? – Mureinik
可能与这个问题有关:http://stackoverflow.com/questions/23546773/sql-query-help-multiple-joins/23546915#23546915 –