Question

更具体地说，我想将Email表中的AspNetUsers列设置为另一个表中的外键。

我希望能很好地解释我的问题。

Answer 1

在SQL Server中，外键必须是引用表的主键。它不允许任何其他列（或复合列键），即使该列具有UNIQUE约束。

所以不，你不能。

Answer 2

是的，您可以使用流利的api在asp.net核心中通过主键进行外键操作。您可以从here

的Microsoft文档中看到一个示例

Answer 3

我能够为非pk列创建外键。没问题。

CREATE TABLE [dbo].[t1](
[id] [int] NOT NULL,
[fldKey] [int] NULL,
CONSTRAINT [PK_t1] 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

CREATE TABLE [dbo].[t2](
[id] [int] NOT NULL,
[t1] [int] NULL,
CONSTRAINT [PK_t2] 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].[t2]  WITH CHECK ADD  CONSTRAINT [FK_t2_t1] FOREIGN 
KEY([t1])
REFERENCES [dbo].[t1] ([fldKey])
GO
ALTER TABLE [dbo].[t2] CHECK CONSTRAINT [FK_t2_t1]
GO

是否可以将非主键设置为另一个表中的外键？

3 个答案: