The Alter Table Statement Conflicted

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");
}

The ALTER TABLE statement conflicted

As the error clearly states: there are rows in your table that violate your check constraint.

Since your check constraint tests for kuri.fnGetAge(kuri_Cust_ID,amt) >= 1,
you can find those rows in violation of this check constraint using

  SELECT * FROM Kuri.Payment
  WHERE kuri.fnGetAge(kuri_Cust_ID, amt) < 1

Fix or delete those rows, and then you should be fine and your ALTER TABLE command should work

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.

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)

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