[英]I can not make a composite relationship between 2 tables in SQL Server
我的下一個模式,我想相關的表COMPANIES_COUNTRIES
和TIME_TRACKING_REQUEST_TYPE
通過CountryId
和CompanyId
。
兩個表的腳本如下:
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
我試圖與下一個腳本建立復合關系,但沒有奏效:
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);
我收到此錯誤(抱歉,是西班牙語):
消息 1776,級別 16,狀態 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,級別 16,狀態 0,第 1 行
沒有 se pudo crear la restricción o el índice。 前部錯誤。
我想將兩個字段都設置為 UNIQUE,但我不能因為我可以重復同一公司和國家/地區的記錄。
你為什么會這樣?
提前致謝。
外鍵引用唯一的“標識符”。 在您的情況下,您的標識符是 COMPANIES_COUNTRIES 上的主鍵(CountryId、CompanyId)。 你的外鍵應該指向那個而不是 (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 上創建一個代理鍵(身份)作為主鍵,並將其用作子表中的 FK。
錯誤信息很清楚。 “引用表 ('COMPANIES_COUNTRIES') 中沒有與外鍵 'FK_TIME_TRACKING_REQUEST_TYPE_COMPANY_COUNTRY' 中引用的列列表匹配的主鍵或候選鍵。消息 1750,級別 16,狀態 0,第 1 行無法創建約束或索引。請參閱上面的錯誤。
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