Question

I have two tables that are connected via a join table in a many-to-many relationship in the Entity Framework. I need to add a composite primary key in the join table for the two columns that are related to the joined tables via standard foreign keys but I’m sure how to do that.

Answer 1

If your join table has a composite key on both foreign keys, the Entity Framework designer in VS2008/2010 should pick up on that.

SQL:

CREATE TABLE MyTable
(
  ColumnFK1  int,
  ColumnFK2  int

PRIMARY KEY (ColumnFK1, ColumnFK2)
)

If the table is already created you can modify the primary key in Management Studio.