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[英]Need assistance SQL error (ORA-02270) : no matching unique or primary key for this column-list error
[英]how to fix “ORA-02270: no matching unique or primary key for this column-list ” error in sql
問題發生在FLIGHT表中,
create table LOCATION (
airportCode VARCHAR2(10) not null,
country VARCHAR2(15) not null,
address VARCHAR2(50) not null,
PRIMARY KEY(airportCode));
create table ROUTE (
routeID VARCHAR2(10) not null,
airportCode VARCHAR2(10) not null,
description VARCHAR2(100) not null,
PRIMARY KEY(routeID, airportCode),
FOREIGN KEY(airportCode) REFERENCES LOCATION(airportCode));
create table NEACC (
memberID VARCHAR2(20),
flightGoldpoints NUMBER,
PRIMARY KEY(memberID));
create table STAFF (
staffID VARCHAR2(20) not null,
memberID VARCHAR2(20) not null,
name VARCHAR2(20) not null,
address VARCHAR2(50) not null,
email VARCHAR2(30) not null,
phone NUMBER not null,
passportNum NUMBER not null,
PRIMARY KEY(staffID),
FOREIGN KEY(memberID) REFERENCES NEACC(memberID));
create table FLIGHT (
flightID VARCHAR2(20) not null,
routeID VARCHAR2(20) not null,
staffID VARCHAR2(20) not null,
captainOrFirstOfficer VARCHAR2(15) CHECK (captainOrFirstOfficer IN ('captain', 'first officer')) not null,
estDepartDateTime VARCHAR2(20) not null,
actDepartDateTime VARCHAR2(20) not null,
actArriveDateTime VARCHAR2(20) not null,
avgSpeed NUMBER not null,
avgHeight NUMBER not null,
estDuration NUMBER not null,
estFuel NUMBER not null,
PRIMARY KEY(flightID, routeID),
FOREIGN KEY(routeID) REFERENCES ROUTE(routeID),
FOREIGN KEY(staffID) REFERENCES STAFF(staffID));
我得到的錯誤是“ORA-02270:此列列表沒有匹配的唯一或主鍵”。 外鍵和主鍵在航班表中正確引用,但我不明白為什么會出現此錯誤。
Route
表中的主鍵是:
PRIMARY KEY(routeID, airportCode),
適當的外鍵引用需要按順序引用。 那將是:
FOREIGN KEY(routeID, airportCode) REFERENCES ROUTE(routeID, airportCode),
但是, FLIGHT
沒有airportCode
,所以這不起作用。
我不確定你想采取什么方向 - 從主鍵中刪除airportCode
或將其添加到Flight
表中。 但這是你的問題。
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