[英]I can not make a composite relationship between 2 tables in SQL Server
我的下一个模式,我想相关的表COMPANIES_COUNTRIES
和TIME_TRACKING_REQUEST_TYPE
通过CountryId
和CompanyId
。
两个表的脚本如下:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[COMPANIES_COUNTRIES]
(
[CountryId] [int] NOT NULL,
[CompanyId] [int] NOT NULL,
[Active] [bit] NOT NULL,
[DateCreated] [datetime] NULL,
[DateUpdated] [datetime] NULL,
CONSTRAINT [PK_COMPANIES_COUNTRIES]
PRIMARY KEY CLUSTERED ([CountryId] ASC, [CompanyId] 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
ALTER TABLE [dbo].[COMPANIES_COUNTRIES]
ADD CONSTRAINT [DF_COMPANIES_COUNTRIES_Active] DEFAULT ((1)) FOR [Active]
GO
ALTER TABLE [dbo].[COMPANIES_COUNTRIES] WITH CHECK
ADD CONSTRAINT [FK_COMPANIES_COUNTRIES_COMPANIES]
FOREIGN KEY([CompanyId]) REFERENCES [dbo].[COMPANIES] ([Id])
GO
ALTER TABLE [dbo].[COMPANIES_COUNTRIES] CHECK CONSTRAINT [FK_COMPANIES_COUNTRIES_COMPANIES]
GO
ALTER TABLE [dbo].[COMPANIES_COUNTRIES] WITH CHECK
ADD CONSTRAINT [FK_COMPANIES_COUNTRIES_COUNTRIES]
FOREIGN KEY([CountryId]) REFERENCES [dbo].[COUNTRIES] ([Id])
GO
ALTER TABLE [dbo].[COMPANIES_COUNTRIES] CHECK CONSTRAINT [FK_COMPANIES_COUNTRIES_COUNTRIES]
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'List of countries assigned to each company' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'COMPANIES_COUNTRIES'
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[TIME_TRACKING_REQUEST_TYPE]
(
[Id] [int] IDENTITY(1,1) NOT NULL,
[CompanyId] [int] NOT NULL,
[CountryId] [int] NOT NULL,
[Code] [nchar](3) NOT NULL,
[Description] [nvarchar](200) NOT NULL,
[Active] [bit] NOT NULL,
CONSTRAINT [PK_TIME_TRACKING_REQUEST_TYPE_1]
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
ALTER TABLE [dbo].[TIME_TRACKING_REQUEST_TYPE]
ADD CONSTRAINT [DF_TIME_TRACKING_REQUEST_TYPE_Active] DEFAULT ((1)) FOR [Active]
GO
我试图与下一个脚本建立复合关系,但没有奏效:
ALTER TABLE TIME_TRACKING_REQUEST_TYPE WITH CHECK
ADD CONSTRAINT [FK_TIME_TRACKING_REQUEST_TYPE_COMPANY_COUNTRY]
FOREIGN KEY (CompanyId, CountryId) REFERENCES COMPANIES_COUNTRIES (CompanyId, CountryId);
我收到此错误(抱歉,是西班牙语):
消息 1776,级别 16,状态 0,第 1 行
No hay claves principales ni candidatas en la tabla a la que se hace referencia ('COMPANIES_COUNTRIES') que concuerden con la lista de columnas que hace la referencia en la clave externa 'FK_TIME_TRACKING_REQUEST_TYPE_COMPANY_COUNTRY'。消息 1750,级别 16,状态 0,第 1 行
没有 se pudo crear la restricción o el índice。 前部错误。
我想将两个字段都设置为 UNIQUE,但我不能因为我可以重复同一公司和国家/地区的记录。
你为什么会这样?
提前致谢。
外键引用唯一的“标识符”。 在您的情况下,您的标识符是 COMPANIES_COUNTRIES 上的主键(CountryId、CompanyId)。 你的外键应该指向那个而不是 (CompanyId, CountryId)
ALTER TABLE [dbo].[TIME_TRACKING_REQUEST_TYPE] ADD CONSTRAINT [FK_TIME_TRACKING_REQUEST_TYPE_COMPANY_COUNTRY]
FOREIGN KEY (CountryId, CompanyId)
REFERENCES COMPANIES_COUNTRIES (CountryId, CompanyId);
在 COMPANIES_COUNTRIES 上创建一个代理键(身份)作为主键,并将其用作子表中的 FK。
错误信息很清楚。 “引用表 ('COMPANIES_COUNTRIES') 中没有与外键 'FK_TIME_TRACKING_REQUEST_TYPE_COMPANY_COUNTRY' 中引用的列列表匹配的主键或候选键。消息 1750,级别 16,状态 0,第 1 行无法创建约束或索引。请参阅上面的错误。
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