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我在连接MSSQL Management Studio 上的两个表时遇到问题。 我的目标是通过外键连接表，如果我删除用户，我希望第二个表条目将被自动删除。我计划为此使用 DELETE Cascade 方法。

User:
CREATE TABLE [dbo].[Users](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[Email] [nvarchar](89) NOT NULL,
[Name] [nvarchar](25) NOT NULL,
[Midname] [nvarchar](25) NOT NULL,
[Surname] [nvarchar](25) NOT NULL,
[Phone] [varchar](15) NOT NULL,
[Country] [smallint] NOT NULL,
[Manager] [nvarchar](89) NOT NULL,
[Referrer] [nvarchar](89) NOT NULL,
[Rank] [tinyint] NOT NULL,
CONSTRAINT [PK_Users] PRIMARY KEY CLUSTERED 
(
[Email] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,      ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
  ) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

电子邮件是主键

Payments:
 CREATE TABLE [dbo].[Investments](
[ID] [bigint] NOT NULL,
[Investor] [nvarchar](89) NOT NULL,
[Sum] [decimal](19, 4) NOT NULL,
[Currency] [smallint] NOT NULL,
[Credit] [decimal](19, 4) NOT NULL,
[CreditRate] [decimal](19, 4) NOT NULL,
[Rate] [tinyint] IDENTITY(1,1) NOT NULL,
[Date] [smalldatetime] NOT NULL,
[Comment] [nvarchar](max) NOT NULL,
CONSTRAINT [PK_Investments] PRIMARY KEY CLUSTERED 
(
        [ID] ASC
 )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF,     ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
  ) ON [PRIMARY]

 GO

ID 是主键

我的 FK 应该是 USER->PAYMENTS 还是 PAYMENTS->USER？

当我尝试通过电子邮件-> 投资者使用外键连接用户-> 付款时，它告诉我这样的错误：

表“付款”中的列与现有主键或唯一约束不匹配。

你能解释一下问题出在哪里吗？我做错了什么？

4

2 回答 2

3

将您的结构更改为：

CREATE TABLE [dbo].[Users](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[Email] [nvarchar](89) NOT NULL,
[Name] [nvarchar](25) NOT NULL,
[Midname] [nvarchar](25) NOT NULL,
[Surname] [nvarchar](25) NOT NULL,
[Phone] [varchar](15) NOT NULL,
[Country] [smallint] NOT NULL,
[Manager] [nvarchar](89) NOT NULL,
[Referrer] [nvarchar](89) NOT NULL,
[Rank] [tinyint] NOT NULL);

ALTER TABLE [Users]
ADD CONSTRAINT PK_UsersID PRIMARY KEY (ID);

进而

CREATE TABLE [dbo].[Investments](
[ID] [bigint] NOT NULL,
[UserID] [bigint] NOT NULL,
[Sum] [decimal](19, 4) NOT NULL,
[Currency] [smallint] NOT NULL,
[Credit] [decimal](19, 4) NOT NULL,
[CreditRate] [decimal](19, 4) NOT NULL,
[Rate] [tinyint] IDENTITY(1,1) NOT NULL,
[Date] [smalldatetime] NOT NULL,
[Comment] [nvarchar](max) NOT NULL);

ALTER TABLE Investments
ADD CONSTRAINT PK_InstestmentsID PRIMARY KEY (ID);

ALTER TABLE Investments
ADD CONSTRAINT FK_UsersInvestments
FOREIGN KEY (UserID)
REFERENCES Users(ID);

然后Users.ID加入Investments.UserID

于 2012-05-30T22:28:22.813 回答
2

我搜索了您看到的错误消息（没有表名），普遍的共识似乎是您的表中没有正确设置a PRIMARY KEYor contraint。UNIQUE该错误还告诉我您（可能）正在使用 SQL Server。

来自technet.microsoft.com：

外键关系的主键端的列必须参与主键或唯一约束。在为您选择的一个表设置主键或唯一约束后，您可以为该表定义其他关系。

检查你PRIMARY KEYS的两个表。如果没有表的实际 DDL，就很难提供更多帮助。

编辑：你在你的表中有Email，但我没有在表中看到一个字段。您要加入哪些领域？PRIMARY KEYUsersEmailInvestments

于 2012-05-30T21:55:56.483 回答