Question

I have a ASP.NET MVC 4 application with EF and I’m not using CodeFirst.
I want my SQL tables to look like this :

Orders 1 —- 0…1 OrdersWithShipment

CREATE TABLE Orders (
OrderId int NOT NULL IDENTITY(1,1),
OrderDate date NOT NULL,
OrderNo int NOT NULL,
ShipmentId Int NULL
CONSTRAINT [Orders_PK] PRIMARY KEY CLUSTERED 
(
   [OrderId] ASC
))

CREATE TABLE OrdersWithShipment (
ShipmentId int NOT NULL IDENTITY(1,1),
OrderId int NULL,
ShipmentDate date NOT NULL 
CONSTRAINT [OrdersWithShipment_PK] PRIMARY KEY CLUSTERED 
(
[ShipmentId] ASC
))

Q : What do I need to do (in SQL and EF) so that I have a 1 — 0…1 relationship ?

Edit :
Can I use unique filtered index link

Answer 1

This is how an 1..0-1 could be defined in SQL (ShipmentId removed from both tables):

CREATE TABLE Orders (
OrderId int NOT NULL IDENTITY(1,1),
OrderDate date NOT NULL,
OrderNo int NOT NULL,
CONSTRAINT [Orders_PK] PRIMARY KEY CLUSTERED 
  ( [OrderId] ASC )
) ;

CREATE TABLE OrdersWithShipment (
OrderId int NOT NULL,
ShipmentDate date NOT NULL, 
CONSTRAINT [OrdersWithShipment_PK] 
  PRIMARY KEY CLUSTERED 
  ( [OrderId] ASC ),
CONSTRAINT [Orders_OrdersWithShipment_FK] 
  FOREIGN KEY 
    ( [OrderId] )
  REFERENCES [Orders] 
    ( [OrderId] )
) ;