Question

我正在为我的学校做一个数据库项目，我偶然发现了一个我似乎无法解决的奇怪问题。这是我在尝试创建表时的代码：

Create table Offering(
StartDate       DATE            NOT NULL    ,       
PRIMARY KEY(StartDate) 
);

Create table OfferPerWeek(
StartDate       DATE            NOT NULL    ,
StartTime       TIME(0)         NOT NULL    ,
[Day]           VARCHAR(10)     NOT NULL
PRIMARY KEY (StartDate,[Day],StartTime)
FOREIGN KEY (StartDate) 
REFERENCES Offering(StartDate)
);

--The table that have the issues 
Create table OfferPerWeek_Venue(  
[Day]           VARCHAR(10)     NOT NULL    ,
StartDate       DATE            NOT NULL    , 
StartTime       TIME(0)         NOT NULL    
PRIMARY KEY (StartDate, [Day], StartTime)
FOREIGN KEY (StartDate, [Day], StartTime) 
REFERENCES OfferPerWeek (StartDate, [Day] , StartTime)
);

错误消息说：

在列级FOREIGN KEY约束
中指定了多个键

我对这个问题感到很困惑，我试图创建多个外键，引用父表的那么多主键。

真的希望这可以修复，谢谢

Answer 1

您缺少逗号。尝试：

Create table OfferPerWeek_Venue(  
[Day]           VARCHAR(10)     NOT NULL    ,
StartDate       DATE            NOT NULL    , 
StartTime       TIME(0)         NOT NULL , <-- comma there  
PRIMARY KEY (StartDate, [Day], StartTime), <-- comma there
FOREIGN KEY (StartDate, [Day], StartTime) 
REFERENCES OfferPerWeek (StartDate, [Day] , StartTime)
);

您可以尝试以下命名，命名外键：

Create table OfferPerWeek_Venue(  
[Day]           VARCHAR(10)     NOT NULL    ,
StartDate       DATE            NOT NULL    , 
StartTime       TIME(0)         NOT NULL ,  
CONSTRAINT [PK_GoodName] PRIMARY KEY (StartDate, [Day], StartTime), 
CONSTRAINT [FK_GoodName] FOREIGN KEY (StartDate, [Day], StartTime) 
REFERENCES OfferPerWeek (StartDate, [Day] , StartTime)
);

Answer 2

CREATE TABLE语句在每个CONSTRAINT

之前缺少逗号

列级FOREIGN KEY约束

2 个答案: