[英]Linking queries error code 1052
當試圖在查詢中將兩個表等價連接在一起時,我收到錯誤代碼1052字段列表中的列FireStationHome不明確
這是我在下面使用的代碼:
SELECT FiremanID, FiremanHomeStation,StationPhone
FROM FIRE_REPORT AS F, FIRE_STATION AS FS
WHERE F.FiremanHomeStation = FS.FiremanHomeStation
AND StationPhone ='703';
通過閱讀論壇,我了解到我需要通過鏈接鍵來鏈接第一個關系。 FiremanHomeStation是運行以下說明所需的唯一鏈接鍵。
顯示所有以“ 703”開頭的消防員的FiremanID,FiremanHomeStation和站的電話號碼。
使用Boyce Codd方法,我將以下內容標准化
FIRE_REPORT(FireID,Alarms,Address,FiremanID,FiremanName,FiremanPhone,FiremanHomeStation,StationAddress,StationPhone,TruckID,LicensePlate)
規則:
每個大火可以指派多名消防員
每個大火可以分配幾輛消防車
每個消防員可以被分配到幾次火災
每輛消防車被分配到幾場大火
每位消防員都有一個家庭駐地
每個站都是唯一的
每個電台都有一個電話號碼
主鍵
FireID, FiremanID, FiremanHomeStation,TruckID
FireID -> Alarms, Address
FiremanID -> FiremanName, FiremanPhone, FiremanHomeStation
FiremanHomeStation -> StationAddress, StationPhone
TruckID -> LicensePlate
FIRE_REPORT( FireID,FiremanID,FiremanHomeStation,TruckID )
火警( FireID ,警報,地址)
FIREMAN_ID( FiremanID ,FiremanName,FiremanPhone)
FIRE_STATION( FiremanHomeStation , StationAddress , StationPhone )
卡車( TruckID ,LicensePlate)
參照完整性約束
FIRE_REPORT中的FireID必須存在於FIRE中的FireID中
FIRE_REPORT中的FiremanID必須存在於FIREMAN_ID中的FiremanID中
FIRE_STPORT中的FiremanHomeStation必須存在於FIRE_STATION中的FiremanHomeStation中
FIRE_REPORT中的TruckID必須存在於TRUCK的TruckID中
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>
兩個表中都存在FiremanHomeStation,但是您沒有指定要從哪個表中獲得結果,這是不明確的。
SELECT FiremanID, FS.FiremanHomeStation,StationPhone
FROM FIRE_REPORT AS F, FIRE_STATION AS FS
WHERE F.FiremanHomeStation = FS.FiremanHomeStation
AND StationPhone ='703';
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