Question

我试图这样做，

CREATE TABLE [dbo].[tblPerson](
[ID] [int] NOT NULL,
[Personame] [varchar](50) NULL)
[Email] [varchar](50) NULL,
[GenderId] [int] NULL

CREATE TABLE [dbo].[tblGender]( [id] [int] NOT NULL, [Gender] nvarchar NOT NULL)

Alter table tblPerson Add Constraint tblPerson_GenderId_FK Foreign Key (GenderId) references tblGender(id)

我得到以下错误不确定为什么

Msg 547，Level 16，State 0，Line 2 ALTER TABLE语句与FOREIGN KEY约束冲突＆＃34; tblPerson_GenderId_FK＆＃34;。冲突发生在数据库＆＃34; Sqlkudavenkat＆＃34;，table＆＃34; dbo.tblGender＆＃34;，column＆＃39; id＆＃39;。

Answer 1

我怀疑tblGender是新表，在这种情况下，您需要在创建外键之前使用值填充它。

假设在tblPerson中你在GenderID

中使用了2个值

0 meaning male
1 meaning female

然后您的查询可能如下所示：

CREATE TABLE [dbo].[tblGender]( [id] [int] NOT NULL, [Gender] nvarchar(100) NOT NULL)

insert into tblGender(id, gender)
select distinct p.GenderID, 
       case when p.GenderID = 0 then 'Male' 
            when p.GenderID = 1 then 'Female'
            else 'it came from outer space' 
       end
from   tblPerson p

Alter table tblPerson Add Constraint tblPerson_GenderId_FK Foreign Key (GenderId) references tblGender(id)

无法与另一个表创建外键关系

1 个答案: