SQL Server 2008: The columns in table do not match an existing primary key or unique constraint

Question

I need to make some changes to a SQL Server 2008 database.

This requires the creation of a new table, and inserting a foreign key in the new table that references t

Answer 1

That looks like you are trying to create a foreign key in tblTwo that does not match (or participate) with any primary key or unique index in tblOne.

Check this link on MSDN regarding it. Here you have another link with a practical case.

EDIT:

Answwering to your comment, I understand you mean there are 2 fields in the primary key (which makes it a composite). In SQL it is not possible to have 2 primary keys on the same table.

IMHO, a foreign key field should always refer to a single register in the referenced table (i.e. the whole primary key in your case). That means you need to put both fields of the tblOne primary key in tblTwo before creating the foreign key.

Anyway, I have investigated a bit over the Internet and it seems SQL Server 2008 (as some prior versions and other RDBMS) gives you the possibility to reference only part of the primary key as long as this part is a candidate key (Not Null and Unique) and you create an unique constraint on it.

I am not sure you can use that in your case, but check this link for more information on it.