Question

I’ve got a conjoining table, which I need to insert into with LINQ. But I can’t insert into it because it has no primary key. I created a “Unique Key” which is a composite in the VS2010 table designer, but LINQ still won’t accept it. How can I create a composite primary key so that I can insert into this table?

Answer 1

ALTER TABLE tablename ADD PRIMARY KEY (column1, column2);

Or in the designer hold down control when selecting the columns before the right click.