Trouble adding foriegn keys

Question

I am trying to add a foriegn key to a table through the wizard in the sql server diagram tools. I select the foriegn key table which is film_actors_lookup. The film_actors_lookup table has 2 fields: ActorID and FilmID. Both are primary keys for the film_actors_lookup
table. The Film table has a FilmID primary key. The Actor table has an ActorID as a primry key. When I go to add a foriegn key relationship between the Actors table and the film_actors_lookup table, I get the error that both tables must
have the same number of fields. Why is this not working?

Answer 1

Please post the error message.
Both ActorID and FilmID needs to be PRIMARY KEY in respective tables.
You can see it with below script:
USE [TestDatabase]
GO
CREATE TABLE [dbo].[film_actors_lookup] ([FilmID] INT, [ActorID] INT)
GO
CREATE TABLE [dbo].[actors] ([ActorID] INT PRIMARY KEY)
GO
CREATE TABLE [dbo].[films] ([FilmID] INT PRIMARY KEY)
GO
/* Add Foreign Key - ActorID */
ALTER TABLE [dbo].[film_actors_lookup] ADD CONSTRAINT [FK_Actors_Lookup_Actors_ActorID] FOREIGN KEY ([ActorID]) REFERENCES [dbo].[Actors] ([ActorID])
GO
/* Add Foreign Key - FilmID */
ALTER TABLE [dbo].[film_actors_lookup] ADD CONSTRAINT [FK_Actors_Lookup_Films_FilmID] FOREIGN KEY ([FilmID]) REFERENCES [dbo].[Films] ([FilmID])
GO
- Vishal
SqlAndMe.com