我的SQL Server数据库中有以下表格。

客户是用户的子类型,因此我在客户之间引用了用户。

我也想将我的客户链接到我的预订。我想将“客户”表中的外键用作此关系的PK。当我在SQL Server中将其写出时,在“((userid)””下出现此错误:

无效的列“userid”

如何建立这种关系?

Create table [dbo].[User]
(
    [id] int PRIMARY KEY IDENTITY (1,1) NOT NULL,
    [name] varchar(50) NOT NULL,
    [password] nvarchar(100) NOT NULL,
)

Create table [dbo].[Customer]
(
    [userid] int FOREIGN KEY REFERENCES [dbo].[User](id) NOT NULL,
    [street] varchar(40) NOT NULL,
    [housenumber] varchar(10) NOT NULL,
    [postalcode] varchar(10) NOT NULL,
    [phonenumber] varchar(20) NOT NULL,
    [email] varchar(30) NOT NULL,
)

Create table [dbo].[Reservation]
(
    [id] int PRIMARY KEY IDENTITY (1,1) NOT NULL,
    [datum] date NOT NULL,
    [prijs] decimal NOT NULL,
    [levertijd] datetime NOT NULL,
    [ophaaltijd] datetime NOT NULL,
    [leverAdres] varchar(60) NOT NULL,
    [klantId] int FOREIGN KEY REFERENCES [dbo].[Customer](userid) NOT NULL
)

最佳答案

是的,这是可能的,像这样尝试

Create table [dbo].[Customer]
(
  [userid] int not null,
  [street] varchar(40) NOT NULL,
  [housenumber] varchar(10) NOT NULL,
  [postalcode] varchar(10) NOT NULL,
  [phonenumber] varchar(20) NOT NULL,
  [email] varchar(30) NOT NULL,

  constraint PK_UserID primary key ([userid]),
  constraint FK_Customer_User foreign key (userid) references [User] (id)
)

但是我不得不说userid看起来像是一个叫做Customer的表的奇怪的主键

我会这样:
Create table [dbo].[Customer]
(
  [CustomerID] int not null identity,
  [userid] int not null,
  [street] varchar(40) NOT NULL,
  [housenumber] varchar(10) NOT NULL,
  [postalcode] varchar(10) NOT NULL,
  [phonenumber] varchar(20) NOT NULL,
  [email] varchar(30) NOT NULL,

  constraint PK_CustomerID primary key ([CustomerID]),
  constraint FK_Customer_User foreign key (userid) references [User] (id)
)


Create table [dbo].[Reservation]
(
  [id] int PRIMARY KEY IDENTITY (1,1) NOT NULL,
  [datum] date NOT NULL,
  [prijs] decimal NOT NULL,
  [levertijd] datetime NOT NULL,
  [ophaaltijd] datetime NOT NULL,
  [leverAdres] varchar(60) NOT NULL,
  [klantId] int FOREIGN KEY REFERENCES [dbo].[Customer](customerid) NOT NULL

)

07-28 02:59
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