Question

这是我的第一个数据库，我创建了HOTEL，ROOM和GUEST表，但是当我执行BOOKING表时，它不起作用。

错误是：

引用表'ROOM'中没有主键或候选键与外键中的引用列列表匹配 'FK_BOOKING_ROOM'

脚本：

CREATE DATABASE HOTEL
USE HOTEL

CREATE TABLE HOTEL
(
   HolCode      varchar(20) UNIQUE NOT NULL,
   Name     varchar(30),
   City     varchar(20) DEFAULT 'Ha noi',

   CONSTRAINT PK_HOLEL PRIMARY KEY (HolCode)
)


CREATE TABLE ROOM
(
   RoomNo       int,
   HolCode      varchar(20),
   TypeRoom     char(1)     DEFAULT 'S',
   Price        double precision,

   CONSTRAINT CHK_TYPE CHECK (TypeRoom = 'D' OR TypeRoom = 'S' OR TypeRoom = 'F'),
   CONSTRAINT CHK_PRICE CHECK (10 <= Price AND Price <= 200),
   CONSTRAINT PK_ROOM PRIMARY KEY (RoomNo, HolCode),
   CONSTRAINT FK_ROOM FOREIGN KEY (HolCode) REFERENCES HOTEL(HolCode)
)

-- TAO BANG GUEST
CREATE TABLE GUEST
(
    GuestNo     int,
    GuestName   varchar(30),
    Address     varchar(50),

    CONSTRAINT PK_GUEST PRIMARY KEY (GuestNo)
)

--TAO BANG BOOKING
CREATE TABLE BOOKING
(
    HolNo       varchar(20)     NOT NULL,
    GuestNo     int     NOT NULL,
    DateFrom    DateTime    DEFAULT     GETDATE(),
    DateTo      DateTime,
    RoomNo      int     NOT NULL,

    CONSTRAINT PK_BOOKING PRIMARY KEY (HolNo, DateFrom, RoomNo),
    -- CONSTRAINT FK_BOOKING_HOTEL FOREIGN KEY (HolNo) REFERENCES HOTEL(Code),
    CONSTRAINT FK_BOOKING_GUEST FOREIGN KEY (GuestNo) REFERENCES GUEST(GuestNo),
    CONSTRAINT FK_BOOKING_ROOM FOREIGN KEY (RoomNo, HolCode) 
          REFERENCES ROOM(RoomNo, HolCode)
)

DROP TABLE BOOKING

Answer 1

尝试：

CONSTRAINT FK_BOOKING_ROOM FOREIGN KEY (RoomNo,HolNo)
    REFERENCES ROOM(RoomNo,HolCode)

客房不仅仅由RoomNo标识，因此外键也需要拥有酒店代码。我还建议，作为一个风格点，您尝试在内容应该相同的每个表中使用相同的名称 - 所以HolNo或HolCode，但不是< EM>两个

为什么我不能在列列表中引用？

1 个答案: