链接查询错误代码1052

Question

I am getting error code 1052 Column FireStationHome in field list is ambiguous when trying to equijoin two tables together in a query

This is the code I am using below:

SELECT FiremanID, FiremanHomeStation,StationPhone
FROM FIRE_REPORT AS F, FIRE_STATION AS FS
WHERE F.FiremanHomeStation = FS.FiremanHomeStation
AND StationPhone ='703';

From reading through the forums I am understanding that I need to link the first relation by a linking key. FiremanHomeStation is the only linking key that I need to run the following directions.

Display FiremanID, FiremanHomeStation, and phone number of the station for all firefighters whose numbers begin with '703'.

Using the Boyce Codd Method I have normalized the following

FIRE_REPORT(FireID,Alarms,Address,FiremanID,FiremanName,FiremanPhone,FiremanHomeStation,StationAddress,StationPhone,TruckID,LicensePlate)

The rules:

Each Fire can have several firefighters assigned to it
Each fire can have several fire trucks assigned to it
Each firefighter can be assigned to several fires
Each fire truck and be assigned to several fires
Each Firefighter has a single home station
Each station is unique
Each station has a single phone number

primary keys

FireID, FiremanID, FiremanHomeStation,TruckID

FireID -> Alarms, Address
FiremanID -> FiremanName, FiremanPhone, FiremanHomeStation
FiremanHomeStation -> StationAddress, StationPhone
TruckID -> LicensePlate

FIRE_REPORT( FireID, FiremanID, FiremanHomeStation, TruckID )
FIRE( FireID , Alarms, Address)
FIREMAN_ID( FiremanID , FiremanName, FiremanPhone)
FIRE_STATION( FiremanHomeStation , StationAddress, StationPhone)
TRUCK( TruckID , LicensePlate)

Referential integrity constraints
FireID in FIRE_REPORT must exist in FireID in FIRE
FiremanID in FIRE_REPORT must exist in FiremanID in FIREMAN_ID
FiremanHomeStation in FIRE_REPORT must exist in FiremanHomeStation in FIRE_STATION
TruckID in FIRE_REPORT must exist in TruckID in TRUCK

create schema project_george;<br>
use project_george;<br>

CREATE TABLE FIRE   (<br>
    FireID int(3) NOT NULL,<br>
    Alarms int(1) NOT NULL,<br>
    Address varChar(25) NOT NULL,<br>
        CONSTRAINT FIRE_PK PRIMARY KEY(FireID),<br>
        CONSTRAINT FIRE_FR_FK FOREIGN KEY(FireID)<br>
        REFERENCES FIRE_REPORT(FireID)<br>
        ON UPDATE CASCADE<br>
);<br>
CREATE TABLE FIREMAN_ID (<br>
    FiremanID int(3) NOT NULL,<br>
    FiremanName varchar(25) NOT NULL,<br>
    FiremanPhone char(10) NOT NULL UNIQUE,<br>
        CONSTRAINT FI_PK PRIMARY KEY(FiremanID),<br>
        CONSTRAINT FI_FR_FK FOREIGN KEY(FiremanID)<br>
        REFERENCES FIRE_REPORT(FiremanID)<br>
        ON UPDATE CASCADE<br>
);<br>
CREATE TABLE FIRE_STATION   (<br>
    FiremanHomeStation varChar(25) NOT NULL UNIQUE,<br>
    StationAddress varChar(25) NOT NULL,<br>
    StationPhone char(10) NOT NULL,<br>
        CONSTRAINT FS_PK PRIMARY KEY(FiremanHomeStation),<br>
        CONSTRAINT FS_FR_FK FOREIGN KEY(FiremanHomeStation)<br>
        REFERENCES FIRE_REPORT(FiremanHomeStation)<br>
        ON UPDATE CASCADE<br>
);<br>
CREATE TABLE TRUCK  (<br>
    TruckID int(3) NOT NULL,<br>
    LicensePlate char(5) NOT NULL UNIQUE,<br>
            CONSTRAINT TRUCK_PK PRIMARY KEY(TruckID),<br>
            CONSTRAINT TRUCK_RC_FK FOREIGN KEY(TruckID)<br>
            REFERENCES FIRE_REPORT(TruckID)<br>
            ON UPDATE CASCADE<br>
);<br>

CREATE TABLE FIRE_REPORT    (<br>
    FireID  int(3)  NOT NULL,<br>
    FiremanID int(3) NOT NULL,<br>
    FiremanHomeStation varChar(25) NOT NULL,<br>
    TruckID int(3) NOT NULL,<br>
        CONSTRAINT FR_PK PRIMARY KEY(FireID,FiremanID,FiremanHomeStation,TruckID),<br>
        CONSTRAINT FR_F_FK FOREIGN KEY (FireID)<br>
        REFERENCES FIRE(FireID) <br>
            ON UPDATE CASCADE,<br>
        CONSTRAINT FR_FID_FK FOREIGN KEY(FiremanID)<br>
        REFERENCES FIREMAN_ID(FiremanID)<br>
            ON UPDATE CASCADE,<br>
        CONSTRAINT FR_FS_FK FOREIGN KEY(FiremanHomeStation)<br>
        REFERENCES FIRE_STATION(FiremanHomeStation)<br>
            ON UPDATE CASCADE,<br>
        CONSTRAINT FR_TRUCK_FK FOREIGN KEY(TruckID)<br>
        REFERENCES TRUCK(TruckID)<br>
            ON UPDATE CASCADE<br>
);<br><br>

INSERT INTO FIRE VALUES(100, 1, '4025 Medford dr, Annandale VA 22003');<br>
INSERT INTO FIRE VALUES(101, 2, '7031 Little River Turnpike Suite 5A
Annandale, VA 22003-5958');<br>
INSERT INTO FIRE VALUES(102, 3, '7001 Little River Turnpike, Annandale, VA 22003 ');<br>
INSERT INTO FIRE VALUES(103, 4, '8333 Little River Turnpike Annandale, VA 22003');<br>
INSERT INTO FIRE VALUES(104, 5, '1600 Pennsylvania Ave NW  Washington, DC 20500');<br><br>

INSERT INTO FIREMAN_ID VALUES(100, 'Guliza Ormuzokova', '703-221-9918');<br>
INSERT INTO FIREMAN_ID VALUES(101, 'Lex Steele', '703-911-4450');<br>
INSERT INTO FIREMAN_ID(FiremanID,FiremanName,FiremanPhone) VALUES(102, 'George Putnam', '703-222-9918');<br>
INSERT INTO FIREMAN_ID VALUES(103, 'Steven Drasner', '571-939-1234');<br>
INSERT INTO FIREMAN_ID VALUES(104, 'Judy Miller', '571-999-1234');<br>
INSERT INTO FIREMAN_ID VALUES(105, 'Lily Thai', '703-911-4451');<br><br>

INSERT INTO FIRE_STATION VALUES('Station 29', '571 Broad st
Fairfax VA 22030', '703-200-9918');<br>
INSERT INTO FIRE_STATION VALUES('Station 229', '8914 Little River Turnpike, Fairfax, VA 22031 ', '703-900-4450');<br>
INSERT INTO FIRE_STATION VALUES('Station 429', '3988 University Dr, Fairfax, VA 22030 ', '571-900-1234');<br><br>

INSERT INTO TRUCK VALUES(1, 'burn29');<br>
INSERT INTO TRUCK VALUES(2, 'burn19');<br>
INSERT INTO TRUCK VALUES(3, 'burn09');<br><br>

/************I can't figure this on out!!!*** *****/<br>
SELECT FiremanID, FiremanHomeStation,StationPhone<br>
FROM FIRE_REPORT AS F, FIRE_STATION AS FS<br>
WHERE F.FiremanHomeStation = FS.FiremanHomeStation<br>
AND StationPhone ='703';<br>

Answer 1

FiremanHomeStation is existing in both table but you don't specify from which table you want the result, which is ambiguous.

SELECT FiremanID, FS.FiremanHomeStation,StationPhone
FROM FIRE_REPORT AS F, FIRE_STATION AS FS
WHERE F.FiremanHomeStation = FS.FiremanHomeStation
AND StationPhone ='703';

Should work