我嘗試在一列到兩列主鍵之間創建一個外鍵,並且SQL Server拒絕了這個鍵。爲什麼?從多列主鍵中包含的一列到另一列的外鍵
我有一張桌子來儲存我的措辭在不同的語言和國家表。
ref.SystemLabels
--------------
--> [Id] int
| [IdLanguage] int
| Label nvarchar(200)
| Keywords nvarchar(200)
|
| ref.Countries
| --------------
| [Id]
--> IdSystemLabel
IsoCode
在我看來,這是非常邏輯,但我不明白爲什麼SQL Server不理解或接受我的邏輯^^。
如果有人能幫我解決這個問題。
注意我想另一種方式,我會在IdSystemLabel上創建一個索引,儘管有一個外鍵。
編輯:至於你問我,請參閱表我的SQL代碼
表SystemLanguages
CREATE TABLE [ref].[SystemLanguages](
[Id] [int] NOT NULL,
[IdSystemLabel] [int] NOT NULL,
[IsoCode] [nchar](2) NOT NULL,
[Enabled] [bit] NOT NULL,
CONSTRAINT [PK_SystemLanguages] 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 [ref].[SystemLanguages] ADD CONSTRAINT [DF_SystemLanguages_Enabled] DEFAULT ((0)) FOR [Enabled]
GO
表SystemLabels
CREATE TABLE [ref].[SystemLabels](
[Id] [int] NOT NULL,
[IdLanguage] [int] NOT NULL,
[Label] [nvarchar](max) NOT NULL,
[Keywords] [nvarchar](200) NULL,
[CreatedAt] [datetime] NOT NULL,
[UpdatedAt] [datetime] NULL,
[Group] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_SystemLabels] PRIMARY KEY CLUSTERED
(
[Id] ASC,
[IdLanguage] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [ref].[SystemLabels] ADD CONSTRAINT [DF_SystemLabels_CreatedAt] DEFAULT (getdate()) FOR [CreatedAt]
GO
注:該表不能有外鍵SystemLanguages由於循環依賴
表LocalizationLevel0
CREATE TABLE [ref].[LocalizationLevel0](
[Id] [int] NOT NULL,
[IdSystemLabel] [int] NOT NULL,
[IsoCode] [nchar](2) NOT NULL,
[CreatedAt] [datetime] NOT NULL,
[UpdatedAt] [datetime] NULL,
[Enabled] [bit] NULL,
CONSTRAINT [PK_LocalizationLevel0] 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 [ref].[LocalizationLevel0] ADD CONSTRAINT [DF_LocalizationLevel0_CreatedAt] DEFAULT (getdate()) FOR [CreatedAt]
GO
ALTER TABLE [ref].[LocalizationLevel0] ADD CONSTRAINT [DF_LocalizationLevel0_Enabled] DEFAULT ((0)) FOR [Enabled]
GO
我想解釋一下我的邏輯:
一個localizationlevel0項目可以有多種系統語言的翻譯:
示例fo [R法國國家
1 4 'FR' '2015-04-17 00:00:00:000' NULL 1
- 系統語言
1 1 'FR' 1
2 2 'EN' 1
3 3 'DE' 1
- 通訊字眼
1 1 'Français' NULL '2015-04-17 00:00:00:000' NULL 'SystemLanguages'
1 2 'French' NULL '2015-04-17 00:00:00:000' NULL 'SystemLanguages'
1 2 'Französisch' NULL '2015-04-17 00:00:00:000' NULL 'SystemLanguages'
...
4 1 'France' NULL '2015-04-17 00:00:00:000' NULL 'LocalizationLevel0'
4 2 'France' NULL '2015-04-17 00:00:00:000' NULL 'LocalizationLevel0'
4 3 'Frankreich' NULL '2015-04-17 00:00:00:000' NULL 'LocalizationLevel0'
你到底想達到什麼目的?外鍵和索引是兩個不同的東西... – jarlh
這可能意味着有一列到兩列外鍵可能是什麼意思?這將施加什麼樣的參考約束。 –
也發佈你的SQL。 –