I'm using a datetime column in SQL Server 2000 as a unique key, and I'm trying to query the data using a Microsoft Access form. I can query the data, but when I try to create two new rows that have primary keys, such as 2003-04-17 00:00:00:00 and 2003-04-17 00:00:00:01, I get an error message indicating that I've entered a duplicate key. What's the problem?