引用的 table 'Card' 中没有与外键中的引用列列表匹配的主键或候选键

Question

创建 table 个脚本：

Create Table [Card]
(
    GiveDate Date not null, 
    PN nvarchar(50) not null, 
    FOREIGN KEY (PN) REFERENCES Patient (PN),
    PRIMARY KEY (GiveDate,PN)
)

Create table [Registration]
(
    EntryDate Date not null,
    ExitDate Date, 
    RoomId int not null,
    CardGiveDate date not null, 
    PN nvarchar(50) not null,
    PRIMARY KEY (PN, EntryDate, CardGiveDate),
    FOREIGN KEY (PN, CardGiveDate) REFERENCES [Card](PN, GiveDate)
)

我查看了 this，但对我没有帮助。

卡片table有主键

Answer 1

Card 中的 PK 是 (GiveDate, PN) ，但您的 FK 引用了一个键 (PN, GiveDate) - 列的顺序 必须匹配 ！所以在你的 Registration table:

中试试这个

Create table [Registration]
(
    EntryDate Date not null,
    ExitDate Date, 
    RoomId int not null,
    CardGiveDate date not null, 
    PN nvarchar(50) not null,
    PRIMARY KEY (PN, EntryDate, CardGiveDate),
    -- make sure to specify the columns in the same order as they are defined in the referenced table!
    FOREIGN KEY (PN, CardGiveDate) REFERENCES [Card](GiveDate, PN)
)

引用的 table 'Card' 中没有与外键中的引用列列表匹配的主键或候选键

There are no primary or candidate keys in the referenced table 'Card' that match the referencing column list in the foreign key

sql-server

weak-entity