PrimaryKey consisting of two PKs with autoincrement?

I want to create a table where I can make a history of a file, while it's
processed by my application. The file will change and even get a new file, so
I created a Document table and a Journal table. The Journal table contains
the time, the event that did occure and a FK to the Document table. One line
represents a specific document (one unique file).
I added two primary keys to this table, one for the transaction and one for
the document itself. So always when a file changes (gets a new file) a new
line will be inserted with a new document key, but the same transaction key.
When a completly new file gets processed a new transaction should start and
the document key will again begin by zero.
I just would like to new if it is possible to make the document key
autoincremental, so that I don't have to worry about it in the application. I
don't really think that the transaction key can be made autoincremental, as
the database does not know, if it is a completly new file or just a new
version of an older file.
But could there be any problems with making the document key
autoincremental? I just want it to be zero again, every time a new
transaction key starts, but I think the database will just count on.Hi
Take a look at an INDETITY property that is a good choice for artificial
keys.
"Stampede" <Stampede@.discussions.microsoft.com> wrote in message
news:F835C787-5BC8-4835-A31D-D38C4EA581A1@.microsoft.com...
> I want to create a table where I can make a history of a file, while it's
> processed by my application. The file will change and even get a new file,
so
> I created a Document table and a Journal table. The Journal table contains
> the time, the event that did occure and a FK to the Document table. One
line
> represents a specific document (one unique file).
> I added two primary keys to this table, one for the transaction and one
for
> the document itself. So always when a file changes (gets a new file) a new
> line will be inserted with a new document key, but the same transaction
key.
> When a completly new file gets processed a new transaction should start
and
> the document key will again begin by zero.
> I just would like to new if it is possible to make the document key
> autoincremental, so that I don't have to worry about it in the
application. I
> don't really think that the transaction key can be made autoincremental,
as
> the database does not know, if it is a completly new file or just a new
> version of an older file.
> But could there be any problems with making the document key
> autoincremental? I just want it to be zero again, every time a new
> transaction key starts, but I think the database will just count on.