The ALTER TABLE statement conflicted with the FOREIGN KEY constraint
I got same problem, my table had data therefore I changed foreign key column to nullable.
AddColumn("dbo.Students", "CountryID", c => c.Int(nullable: true));
You should change your code like that then run again Update-Database -Verbose
public override void Up()
{
CreateTable(
"dbo.Countries",
c => new
{
ID = c.Int(nullable: false, identity: true),
CountryName = c.String(),
})
.PrimaryKey(t => t.ID);
AddColumn("dbo.Students", "CountryID", c => c.Int(nullable: true));
CreateIndex("dbo.Students", "CountryID");
AddForeignKey("dbo.Students", "CountryID", "dbo.Countries", "ID", cascadeDelete: true);
DropColumn("dbo.Students", "Country");
}
ALTER TABLE statement conflicted with the FOREIGN KEY constraint
You want to identify any "do not align" rows....
I have made the below.
You won't be able to add the FK constraint, if any rows come back from the SELECT query.
I have also removed the hungarian notation for "tbl". I would advise against it.
create table dbo.Person(
ID int not null primary key,
Fullname varchar(50) not null,
Email varchar(50) not null,
GenderId int )
create table dbo.Gender (
ID int not null primary key,
Gender varchar(50) not null
)
/* any rows below? your FK creation will fail */
Select *, p.GenderId as 'HoustonWeHaveAProblemValue' from dbo.Person p Where Not Exists (Select 1 from dbo.Gender g where g.ID = p.GenderId)
alter table dbo.Person add constraint Person_GenderId_FK
foreign key (GenderId) references dbo.Gender(ID)
i getting this error: The ALTER TABLE statement conflicted with the FOREIGN KEY constraint foreign_key1
In MySQL you can use this:
CREATE TABLE producer(
name varchar(20),
PRIMARY KEY (name)
);
CREATE TABLE song(
id int,
name varchar(50) not null,
singer varchar(50) not null,
producer varchar(50) not null,
album varchar(50) not null,
total_sell int not null,
PRIMARY KEY (`id`),
CONSTRAINT `foreign_key1` FOREIGN KEY (`producer`) REFERENCES `producer` (`name`)
);
OR:
ALTER TABLE `song`
ADD CONSTRAINT `foreign_key1`
FOREIGN KEY (`producer`)
REFERENCES `producer` (`name`)
ON DELETE NO ACTION
ON UPDATE NO ACTION;
you can see Here.
I can advise you to declare the same length as the name column. es. varchar(50)
The ALTER TABLE statement conflicted with the FOREIGN KEY constrain
The default value of 1 that you've specified for the Workspace.WorkspaceSettingsId
column does not yet exist in your WorkspaceSettings
table, hence the FK violation.
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint sql
In order to add the FK, you have to make sure that storefileID 0 is present in the table StoredFile (e.g. by adding a dummy record) - otherwise the FK validation fails and the constraint can not be created.
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